I believe the roll pin that holds the u-joint to the output shaft is 3/16". The stock roll pin (on my TC at least) is a single spiral pin so it's best to use a punch that is the right size but if you're careful, you can use a smaller one. If you choose to replace the roll pin, sometimes you get a big roll pin with a small one - you drive in the big one first, then the small one. The single roll pins are sometimes hard to find but the two pin set up is perfectly good. Also watch out for the shims under the u-joint. If you are using the same u-joint on that output shaft, you'll want to use the same shims. (ok, I wandered off topic a little)
I'm not familiar with the Renault motor but you might look at taking off the intake and exhaust manifolds and bolt a chain to the studs or bolts that held them on. Another tact you might want to consider is getting some rope and try to tie it on both sides. You will probably want it to be somewhat balanced so it doesn't get away from you when you unbolt it from the car.
Maybe the best way is to pick up the motor and tranny in one piece, but consider taking them out separately. It's been a long time since I did mine so I don't really remember, but I have taken the tranny out by it self a few times so taking the tranny out first is an option. Also check to see what they advise in the workshop manual.
I think it's probably best to pull the motor up and out. You probably want to minimize how high you put the car when it's on stands or blocks. In fact, you may want to take the rear suspension off and then lower the car.
I assume you're going to use a hoist from a friend or rented from a car parts store.
Somebody else will probably have more recent and better advise but hopefully that will give you some thing to think about. It shouldn't be very difficult but you might have to stare at it for a while. Make sure all the cables, wires, and hoses are disconnected first.
Good luck and let us know how it goes!!!