I used to just buy whatever was sold to me from any typical auto store for street use and never had any issues. As far as time that all depends on your skill level, but here's a list of items to rastle around with...
4 nuts/bolts holding engine to trans
4 bolts mounting end of trans to cross support
2 bolts for cross member
remove intermediate driveshaft
remove gear shifter
remove clutch cable
couple of wires connected to the trans
I think that about covers all of the nut and bolt turning (someone will bust me if I missed somethin),,,then the real fun begins, trying to wiggle the trans out sometimes isn't real easy, the weight is no real issue (I weigh 150 and usually do mine by myself) but it's a tight fit.
Now that I have the 1.6 engine adapter (another 1/4" of metal) mine is near impossible to get in and out without moving the engine
1st time I changed mine it probably took me most of the day but nowadays I can do it in a couple to 3 hrs.