Do a search mate, been covered loads of times.
Basically though by the time you buy the proper renault tools, doing it as a one off doesnt really make much sense as it'll cost you as much as just going to a specialist anyway.
Its one of the more difficult cars to do a cambelt on really, access is limited, and without the genuine tools its difficult to time the cams in properly and if you time them slightly out you'll lose performance.
If you havent got experience of doing cambelts in some ways its probably not the ideal car to be starting on.