The easiest one. The driveshaft is connected to the gearbox stub axle by the roll pin...get a new one from renault as they have updated the design of it to a single piece one now, and some sealant.
Decide if you want to take the driveshaft completely out or not. You can change gaitors with it still attached to hub.
If out, undo the hub nut before jacking up car, get a new one though to replace it with. Remove road wheel, and undo the top strut bolt, and loosen lower one. This will give you enough lateral play in the assembly. Knock out roll pin between driveshaft and stub axle (5mm tap), you will now be able to slide off the driveshaft spline from the stub axle. Now you have a choice, either change gaitor assembly here or press out driveshaft from hub with the puller so you can do it on a bench.
A quick change of gaitor assembly, as part of a kit from renault and put it all back together, with new rool pin, sealant and hub nut (if needed). Easy.