If you haven't done it before, and you are working from a pile of parts (and LR diagrams) you could spend 8 hours on a door to figure it out and assemble it. The diagrams (even in Microcat or JLR Ecat) are crude at best and don't show a lot of the fit detail. It's best to just be patient, and do bits at a time.
I may still have a fair amount of photos from when I put mine together, showing various fit and finish. May post them on my profile page if I can find them.
This