Let's do it step by step. I assume you are holding a frame with hammer, trigger, hand, bolt, etc. installed with the two grip frames apart. In other words, the barrel and cylinder are off and the frame is left. Now make sure the bolt, trigger and trigger spring are in the right place and that the hammer cycles the bolt and hand. At this point, if you drop the cylinder back into place, the cylinder would cycle and lock. Now install the lower grip frame (the one that holds the mainspring). This will cover the bolt, trigger spring, etc. This should go into place fairly easily and you fasten it down with three screws - two rear ones are the same but the front is different. Once this is tight to the frame, attach the mainspring. It's easier to swing it to one side and get the screw started first. Now, all that needs to be done is to put the grips and backstrap in place. That is three screws and you should be finished with nothing left over. Let us know if this helps or we can detail strip it all the way to bare frame and work backwards if necessary.
