Most pistols can be reassembled simply by reversing the order of disassembly, but not always. Check out these tips on 1911 reassembly.
After cleaning or maintenance, most pistols can be reassembled simply by reversing the order of disassembly. And some can’t.
These tips for reassembling a 1911 pistol are from the latest edition of Gun Digest Book of Automatic Pistols Assembly/Disassembly:
When installing the combination spring, slide the mainspring housing partially into the frame to hold the spring in place while replacing the grip safety. (The exploded gun drawing below shows the name and location of parts.)
During reassembly, the most difficult operation is often the alignment of the barrel link with the slide latch hole in the frame. The hole is large enough that the proper alignment can be seen, and the link can be edged into position by moving the slide back and forth a very small distance until it drops into place. Don’t try aligning the link and the clearance cut for the top of the latch at the same time. Get the latch shaft through the link, then swing the latch up and align it with the clearance cut.