Well, let's see....
- If you are ok with preparing a couple of meals a day that are not for yourself... and you won't suffer an aneurysm from watching them subsequently throw half of it on the floor and all over your walls...
- If you are happy to sweep up seed husks, pellet crumbs, bits of flung fruit and vege, pieces of branches and toys... probably twice a day...
- If you don't mind watching a toy you paid $30 for being destroyed in a matter of minutes...
- If you would rush your beloved fid to a specialist avian vet after you suspect they swallowed a piece of metal from your expensive furniture (which they just destroyed)...
- If you like a bit of "wear and tear" on your furniture... clothes... carpet... curtains........ walls.................. that brand new big screen TV
...
- If you don't mind scrubbing your fid's 'beautiful berry based artworks' off your walls... and floors............... and ceiling...
- If looking at poops to determine your fids health doesn't make your stomach turn...
- If you are creative and love coming up with new ways to keep your fid entertained...
- If you have a high tolerance for pain... or at least the ability to grin and bear it long enough to walk into the next room and have a break down...
- If you never liked leaving the house and being social anyway
...
- If the thought of spending an hour chopping fruits, vege and grains and sprouting seeds doesn't make you want to scream... Oh and on the topic of screaming...
- If you can tolerate the sound of your chosen species, aaaaaallllllll day long... on the occasions they choose to be uncharacteristically loud or when the invisible boogey man has upset them... while remaining calm...
Then you are well on your way to being a perfect parront
Youtube is fabulous

I have used it for every species I have researched, though there is no corella volume videos on youtube... I plan to remedy that soon! lol
But I too use it to assist in gauging captive parrots vocalisations and whether or not I could tolerate them. There are heaps of cute videos on there, but there are some really good realistic ones as well.
There is one galah volume video which I am rather unhappy about. She has clearly turned down her voice volume (or is speaking very softly on purpose) to enhance the birds sounds because galahs are not, under any circumstances THAT loud.
You can't even hear her voice if you turn it to the appropriate level for a galah. On top of that she left the birds mate in the other room so they are constantly calling to each other, which is deceptive as well because galahs use their contact call sparingly, for when you initially leave the room for example. They normally only call at full volume when they are distressed.
I understand her wanting to scare off potential owners who aren't patient enough to own a galah... but it also gives landlords, family members, neighbours and other potentially relevant associates the wrong idea about the noise level of galahs. With rentals becoming harder to come by, this is an actual serious issue. This kind of misinformation also encourages councils to change local laws to reflect their perception of galahs as being "noisy cockatoos". Most councils now have the most ridiculous law of not being able to keep "a galah or cockatoo" on a block size smaller than 600sqm. Thats most blocks these days! So I have a house, but can't own a bird species larger than a cockatiel? Thats just nutty!
Yet an indoor galah is not going to be noticed by the neighbours (mine dont have a clue!). With councils continuously decreasing the numbers of other pet species and outlawing some completely... our society is dangerously close to losing touch with animals altogether. I think all kids should grow up with a pet so they can learn to tolerate, appreciate and understand animals. Some suburbs you are unable to own a dog or cat. Others you are limited to one guinea pig. One! lol Its a guinea pig for crying out loud LOL
Sorry for going a bit off topic with my rant!
Back on topic... you are definitely a fabulous parront
because you are worried

Its that kind of genuine concern for our beloved parrots that keeps us researching new and improved ways of parrot keeping or new veterinary methods that may be relevant to our fids. In the end, there will always be things you didn't expect from your new pet that no website or prior experience could have taught you. But the fact that you are trying hard to learn all you can gives you a big step up.
I also completely understand your desire to go for the big one right off the bat... thats probably not something you will hear often but I have been thinking about it recently.
With such long lived species, the idea of having a "starter" bird first may be a well meaning but misplaced concept. There is probably little appropriate knowledge to be gained from the species often recommend as starter birds... especially when you are looking at eventually getting a macaw. Due to their lifespan, any delay you make in purchasing a macaw could have an impact in the life of that bird. I am definitely not saying older people should never know the joy of owning a macaw

Just that if you are certain about adding a macaw to the family, the sooner you do it the less chance there is of your long lived fid needing to readjust to a new family.
If you are 25 when you buy your starter parrot and really have no desire to have two parrots at once... you could be 45 or perhaps even 55 before your "starter bird" passes away.
I think in the end research is the key... because the budgies, conures and cockatiels I owned before getting a galah could not have prepared me for a galah. They are all very different and have unique requirements. Getting hands on interaction with the species of your choice is probably ideal and preferable to a "starter bird". If you plan to have more than one bird, then getting a bird that is generally thought of as easier first certainly couldn't hurt.