Lift out the engine and trans in one unit. You'll need a load leveler on the engine lift. Use good chain and good strong bolts to lift. Look online for lift points, don't just wrap a chain around the belt pulleys on the front of the engine, the angle it will come out will be extreme and you don't want it slipping.
Don't bother trying to pull the auto on the ground, it will be a nightmare. I've done it while the car was on a lift but on the ground, I wouldn't even bother to try.
Easier to pull the whole thing, change everything without killing your back, then just pop it all back in.
Good luck, I've done it 4 times this way and it's not that bad.
Performance one step at a time.