RodBldr is correct. The only thing I would add is to make sure you find the spine first. The butt section won't have much if any flex so you can put the reel seat on first making sure the fighting butt insert has enough room. (I epoxy the insert in right after the epoxy cures for the reel seat). Then fit the grip and then start laying out your guides.
Live life by the three F rule. Family, Friends and Fly Fishing. I will let you put them in order.