Youre going to have fun
Alright, I just did this on Ned (1986 GL Sedan EA82).
1 - Put the car up on jackstands. Remove the bolts from the engine mounts on the crossmember (14mm I believe)
2 - Then take a bottle jack and jack the transmission up as high as you can (disconnect the pitching stopper from the motor - 14mm ratchet and 14mm socket) This will give you some room for the back 6 bolts.
3 - Then an elbow and an extension and I believe a 10mm socket. *lots of patience* its a pain in the neck... If I dont HAVE to, I will not do it in the car again, when its only like a 1 hour process to remove the motor.
4 - You will have to manuever the oil pan off the pick up tube, it wont just drop off.
5 - When doing the gasket, make sure the surface of the motor your putting it on is clean (shouldnt be hard) but the oil pan itself will have a lot of the old gasket on it, which will probably be baked on. Youll need a gasket remover or a razor blade and patience.
Make sure to Ultra Gray RTV the new gasket. a thin layer on both sides and the edges. Let it dry. This SHOULD make it far easier to remove if it ever leaks again, but I doubt that it will leak after this.
Installation is just the same, but dont tighten the bolts until all of them are started at least half-way... then tighten the corners first and work your way around.
Best of luck, if you need more help, let me know.