I just finished my conversion today
easy very easy
The speedo drive is one of the easiest things you will ever do. and be careful with the loop in the speedo cable so its not to tight ( its there because the speedo drive is further forward on the gearbox than on the r32 gearbox
a couple of things I was struggling to find out and couldn't find.
The Nissan gear box cross members all have a letter on them.
You need the A cross member it bolts straight in.
the front half of the drive shaft needs 10-15 mm added to it. You cant use the front half of a r33 tailshaft on the back half of a r32 tailshaft , it is to long.
Any other questions Its fresh in my head