Replacing the sear spring on reassembly on the first shot has always been my biggest hang up. I've gutted 2 1911s down to a bare frame several times. It just takes patience, and it helps if you lay out all the parts in relatively the same order they came out. Also Google 1911 exploded view. It'll help. I have a picture of my last 1911 completely broke down to the frame, every single big and little part removed and cleaned.
2010-07-11005817.jpg picture by john2393 - Photobucket
Once you gut it its really a simple design.