I went through 2 drive axels on my megane when i first started driving (being a young idiot), and my dad and i replaced the axel without taking it to a garage, its quite a simple process really, mine being as you sit behind the wheel the side to your right, you take the wheel, brake etc off, and your right there really, i remember the bolt holding the axel in place being a pain in the arse to get off as it had rusted on, but that was the first one, the next time it came off with ease, probs did the whole lot in an hour.... so if i were you mate id get a haynes manual for your motor and do it yourself, its a good way to learn about maintaining your car, and if all else fails you can get a garage to do it, but at least you've given it a shot?
all imo of course tho...
good luck with it tho mate