Oh man!!! I just posted this a few weeks ago in a thread called "annoying things that happen while building an ARF".

Yes, I did this exact thing. I glued the first one in. then I went to glue in the second one, fumbled with the wing, and somehow realized that the second one wasn't in. It slipped underneath the aileron and looked like it was in but it wasn't. So I had to really twist around the aileron since one of the hinges was in I could only move it so much. But finally I got it in. I thought after "what if I had gotten 3 out of 4 in and glued. There's no way I would be able to get the fourth one in. Even two out of four glued in would have been a distaster.

Anyway, yeah live and learn. No way around it.

Joe