Take the passenger seat out of the car the gear box will come out that side.
Remove the tunnel, remove the overdrive cable and remove the starter motor, remove the rear support bolts from the back of the gear box/overdrive then undo the bolts holding the gear box to the engine from inside and below the car, I left two in the top semi tight to keep things together until may pal came around to give a hand.
The trick is to have a plank of wood below the gear box supported on jacks and another jack at the back of the engine to tilt the whole train up. With the help of a friend just pull the gear box away from the engine, sliding it up the plank. Once clear swing it sideways and out of thepassenger door. Replacement is just the reverse, but you need to judge the angle of the plank a bit as no doubt it will be removed to work on the clutch etc. I installed a rear oil seal whilst I was at it, well worth it but there is a trick in getting the seal into the bolt on housing. Will go into detail should you require it.
Check on all operating components whilst you are in there, I had to buy the complete clutch housing as some springs had broken, renew the thrust washer and re bush the fork in the bell housing. Also replace any oil seals - bell housing to gear box.
Bob