I did this at the weekend. The Genuine Renault cup shocks come with the top mount rubber and nut but not with the bolt for the bottom.
Breaker bar (think 17mm socket) for the bottom, 6mm spanner and 14mm (can't really remember the top spanner size) for the top nut and your away. If you jack the car up and then place the jack under the beam you can nearly raise the beam enough to refit the lower bolt. Inserting said breaker bar through the hole in the ream beam (on the side you are working on) to lift/lower a little helps greatly.
All in all, if you were only doing the shocks it would probably take 45mins including jacking car up and removing wheels. Very straight forward job.
Made a big difference to my car, already had cup shocks however one side was completely gone and would throw the car all over the shop when going over a large undulation in the road.
My advice would be to tackle one job at a time, get the rear end sorted and then focus on the front, its a good time/excuse to replace bushed etc at the same time.
Rob,