I got Raiju clipped when he was around 4-6 months old, not sure how old he actually is. Within about 3 or 4 months his clipped feathers molted, and he began growing his flight feathers. I believe he learned to fly before he was clipped, because he didn't have too much trouble with it. It just took him awhile to be able to fly completely properly, as his feathers were all bit uneven due to some being clipped and some being fully grown during the molting process.
But I did watch a budgie learn how to fly, the one I raised, Phoenix. Phoenix crashed A TON when he was learning to fly. He never crashed enough to completely knock the wind out of him, but man it was scary for awhile. I just had to let him learn, within just a couple of weeks he was an expert
Clipped birds can still escape unless you completely take their entire wings away, which isn't right. A clipped bird still has flight feathers, flight is possible but much harder and not as graceful. Raiju crashed to the ground multiple times when he was clipped, and would bump into walls or even the corner of the desk (ouch
). With the right amount of motivation, fear, and/or wind, they can fly. They can glide right out the door then be taken off by wind. And since they're clipped, they won't be able to escape predators as easily... I think you can see where I'm going with that.
I get scared, too. Especially when they have big crashes, I considered clipping a few times. It seems like it'd be safer on the surface, but it's not. What's really important is to recall train, so even if they get out they will return to you. I haven't had my birds get out yet, but Phoenix has escaped the room once or twice(just as dangerous as we have cats and dogs in the house). I recalled, he came right back inside. I think recall training is a vital and very important skill to have, in all animals