[Richard]

I am assuming tricks for reupholstery.

I used a walking foot sewing industrial sewing machine. A home machine will not sew upholstery leather. You can get one from Sailrite for a reasonable cost. It's more than paid for itself since I have done all the upholstery in the coach, and fixed/repaired a lot of the awnings.
Second, I took the time to take apart the old upholstery and use it for patterns. Total waste of time on the disassembly. Use the existing foam and poster board to make the patterns.
Use NEW foam. I didn't and I'm doing it over again.
A band saw or electric knife work well with foam.
I used leather the first time, but I think I'll go Ultraleather this time.
Take care in attaching the seats back to the frame with as little slack as possible, else they become misaligned when you sit on them. I will probably take the time to sew the bottoms to the adjacent bottoms, and the tops to the adjacent tops when I do it again.
Doing the drawers and case takes almost as much time as the cushions.
It takes more leather than you think. I think I used 7 hides to do two couches, and there wasn't much waste.

Take a trip up to Inverness one day, and you can look at the task first hand.