If you don't have the tools you will be looking at a lot of problems. Lug cutters and links etc. Trigger and sear jigs. They are fun to build and I used to build a lot of custom 1911's in the 80's before so many were available. But I had a gun smithing business and I paid about 2000 for all the equipment for 1911's. Drop in isn't a reality not on a firearm that you may be using to defend your self or your family with. Read a lot about it buy the equipment and then try one. Don't do it to save money. It doesn't work that way. Get a Taurus pt1911 if cost is the issue.