Well I let him get used to his new feathers for nearly 3 months, then just last night I took him in for a clip. I felt bad about it, but I'd feel worse if he got out and was lost. Been through that before and it just takes a second. So the guy at the bird shop just takes out the scissors, counts out how many feathers, and *snip*. Repeat on the other wing. Man he took a lot of feathers off. Then I felt doubly bad about it since when I first brought him home to my apartment, he actually fell off my shoulder and bounced off the carpet a couple times. But I don't have carpet here in the house, it's all hard floors. So I told my son not to let the bird sit anywhere high until he gets used to not being able to fly anymore.
I sat him on the floor near the couch and immediately he jumped/flew up onto my knee. Surprised the heck out of me, I didn't think he could do it! Then just to show off he flew over to his cage almost a whole room away! Man what a relief! So he can still get around the house and I don't have to worry about him dropping like a stone. But he's is noticeably slower and less agile in the air than he was so I don't think he would get far if he were to get outside. Not that I plan on testing that theory! We're still going to be careful about opening up the front door of course.
So big relief for me all the way around. Seems the bird shop guy did a perfect clip. Let's my little Mumble bird still get around the place, yet gives us some hope of not losing him forever if some day we have a momentary door/bird timing error.