How hard to remove a transaxle?

I would not attempt it without a jack (or two, actually). If only the transaxle needs servicing I usually leave the driveshaft in place and only undo the 3 bolts securing the driveshaft to clutch yoke. Then I undo all dedion and transaxle "connections" with jacks supporting dedion and transaxle. After that the whole dedion+transaxle assembly slides straight back an inch or so to free it off the driveshaft and you can lower it and slide out. Installation is reverse. I usually have a jack stand or other support on rear half of driveshaft. Having someone with you that has done it before will speed up the process quite a bit. Other people do it differently, but this is my preferred method.

Besides drive shaft, you've got:
- shift linkage (tap out pin on 75/Milano, undo 2 bolts with 13 mm wrench on GTV6)
- clutch flex line
- brake flex line
- reverse light wires
- speedo sensor wires
- brake pad wear sensor wires (if your have them)
- ABS sensor wires (under rear seat on 75/Milano if you have ABS)
- shocks (at dedion)
- watts linkage (at chassis)
- rear transmission mount
- 6 bolts securing dedion x-member to chassis
to disconnect. Along with what I forgot in the list above

This is not easy to do alone - I would say two people are required when you get to the point of lowering it out of the car.

Once you have the assembly on the ground you can separate the transaxle from the dedion easily by undoing:
- 2 front tranny mounts
- half-shafts

Jes

I have done exactly this in a junkyard and where I was not allowed to use a jack. The car was about 2 feet off of the ground. I wanted to drop the whole de dion but the shock nuts were well rusted preventing that. I ended up undoing the drive shaft (you don't need to remove it, it pops loose when you drop the nose of the box down) and left the gearbox casing held in place by the rearmount. I only wanted the gears themselves so split the casing in-situ and slid the gear section out the front after removing the clutch. This took about 2 hours but allows you to leave the driveshafts, brakes etc in place.

Once the gearbox weight is taken on the rear mount bolt alone there is no way in hell you will get that bolt out by yourself, the weight is too great.

If you want the whole transaxle I'd undo the driveshafts and other connections to the gearbox. I'd then undo the rear gearbox bolt and replace it with a taper pry bar with a right angle on the end. I'd then undo the front cross member bolts using something to wedge up the front of the box (find something in the yard). I'd undo the rear shocks and de-dion linkages, again with something under the dedion. That bend in the prybar? Smack it with a hammer and everything will be loose. Don't be under it! The gearbox is easily separated from the de-dion on the ground.

I found the easiest way to install a complete gearbox into my 75 was to install it on the de-dion and lift the lot using 4 or 5 jacks.