Well, it's hard to say what will happen. All birds can be nippy if you push them past trust point, and all birds use beaks to communicate when signals are missed by people. You absolutely must be committed to no shadowy spaces/ huts/snuggle huts/cuddle huts/BEDDING/ CAVE-like AREAS (LIKE COUCHES or under furniture) and a 10-12 hour bedtime W/ schedule (like a toddler who lives 30 years). Petting on the head and neck only (the rest is sex)...Plus teaching independence, moving at the bird's pace and seriously understanding that this will be like a high-intermittence kid if you are to do it properly (given what we take away from them and impose upon them in captivity). On top of that, even the sweetest baby will be a pain during puberty, much like a 17 year old child...so don't expect a baby to stay sweet 24/7. That doesn't mean they are bad, but they just have to have patience and serious boundaries.
and then no standard household cleaners, candles, aerosols, waxes, essential oils etc, no air fresheners, no burned foot, no ovens on the self clean setting, no perfumes etc. They can be very hormonal and they also have very very sensitive respiratory systems (canaries in the coal mine).
A very very important thing is no ptfe/pfoa/pfcs/ teflon in the same house PERIOD. Doesn't matter what room..cleaners can be similar, but these fumes are one of the most common killers of birds.
Its also important that everyone be on the same page behaviorally--- you cannot "punish" a bird, but ABA can work quite well, as long as everyone understands.
They really are very complex, as pets go...
They are way more complicated/different than cats or dogs, and honestly, quite a lot smarter, not to mention more sensitive to changes and respiratory irritants.
Tiels can be really chill/social compared to their larger counterparts but I am less familiar with parrotlettes (and when I say "chill" I still mean, require hours a day, and still just as smart as the others). The thing is, you just have to be fully committed if you do this, due to the challenges and restrictions they pose (along with many wonderful things)...But there is no way to know for sure, and most definitely, you will have to make some sacrifices.