Oh my freaking gosh... suddenly I don't feel so bad...Congrats and welcome to GlockTalk and Glock ownership! They are generally easy to completely strip and reassemble (if nothing is broken) -- and you pay careful attention! Yours was a nice and easy fix quick fix....but it does continue the threads of the week -- to please pay careful attention when putting your Glock back together.
Don't feel bad, here was one of the more interesting posts of someone recently not paying careful attention when putting their Glock back together:
Live and learn!