I am in the middle of an engine rebuild now. There are no big problems just think it through. You will have to split the engine from the clutch housing so be sure that both are supported and you have a way to roll the engine or back half for clearance and clutch removal. The implements mounted on the tractor will affect balance and weight, I would remove everything. My preference would be to replace pilot bearing, clutch, pressure plate and release bearing. You don't want to go back and do this again so do it right the first time. You can also look at the forward transmission seal for leaks. There is a clutch alignment tool available but it is a bit pricey at $30 plus. I am still looking to find one cheaper. It is a fairly big job to split a tractor but not that complicated. Good luck.
Russell