Start at one end, rearend and leafs, brake parts and lines... To the point where you can attach the wheels.
Then do the same with the front, then you have a roller...
Drop in motor, trans, T-case, finish brake lines on the frame, exhaust work if you have a kit. wait if custom made.
Lower body back on frame with new mounts, let settle a day or so. Check to see if you need shims with the mounts for door gaps.
Bolt down body. Continue bolting on body parts, wiring... etc.
Over simplified, but you get the idea.