If you're going with something like a K-Var Bulgy -74 kit and a pre-made rails installed receiver, then you're set to go. People talk about barrel removal and pressing when doing a rivet build, which requires the barrel be removed to get the front rivets in the trunnion. When doing a screw build, you just drill and tap until you hit the barrel and put your screws in that. For your build, you should just need a dremel, drill, bits, a 8/32 and 10/32 tap, and screws. You're basically attaching the front and rear trunnions and putting the rest of the trigger/hammer and mag parts in. The stickied screw build post at the top of this forum is all you need to know. Technically, you should also check the headspacing before you fire, but if the kit is all matching, headspacing should be fine. Fire it from a string when you put it together, or rent the gauges to do it right.