Once you have mastered the basics, you'll never want to trust the bike to a shop/gargae again. No-one is ever going to take as much care over your bike than you will, Alesi. Why pay someone else to do a less thorough job than you can do yourself for free? There's so much more satisfaction from riding a bike you've worked on yourself. And if it does ever let you down, you are much less likely to be stranded too as you have a fighting chance of getting it going again at the side of the road. Like I said, a win-win situation
Enjoy
Wb