Hunaid, it might take many weeks before you can touch your birds. Be happy for now that they are willing to eat from your hands. Once they are very confident, hopping on and off your hand without appearing to be afraid, you might stop offering your hand full of food and offer instead a small treat. You might use a tiny piece of fruit or vegetable, or a little piece of grass seed: just a small taste of something you know your birds like.
Your aim is to ask your birds 'Step up' and have them hop willingly onto your hand. NEVER force them to do this by pushing your hand against them! Just wait patiently for your birds to come willingly and then reward them with the treat. Budgies are very clever and they will learn quickly IF you go slowly and wait for them to be brave enough to do what you ask.
When you are training your budgies, only spend five or ten minutes at first. Birds will get tired and cross if you train for too long, so just have short sessions two or three times a day. The time you put into this patient training will give good results, but don't try to hurry it along. That will only make your birds nervous and afraid to do as you ask.
I'm working with my corella and we are having an interesting time. Some days, she does exactly what I want. Other days, she's very naughty and bites me. For now, I'm spending as much time as I can with her speaking and reading and singing. When she bites, she goes back into her cage for a time. When she's good, I teach her to do small tricks. The last trick she learned was to whistle when I say 'Sing, Rosetta'. I'm trying to teach her to fetch a ball and put it in my hand, but every time she picks the ball up, she throws it far away. This trick is taking some time, but we'll get it right one day.
Good luck with your budgies and please let us know how you get on.
Betrisher