DIY on the R

After seeing Jonny on 5th gear servicing a fiesta on the tv a couple weeks and showing you how to save money I thought to myself maybe its worth giving it ago myself. If im honest ive done nothing like it myself before and I have no tools but I know where most parts are on the car. Mines not due for a while but if im saving money why not? Ive seen theres DIY places poping up where you can take your car for a small fee and use all there tools etc to do what you want for car so was wondering was it worth it? On a performance car like the R is it more complicated then a standard car? I do want to learn more about fixing cars as my wife has a couple she wants to get sorted out but doesnt have the time or money to do so but if I can do a few jobs on them where half way there. Even on mine the rear diff seals will need changing in the near future and I would like to do some small mods but I dont want to start trying to do these jobs and then bugger the car up. What do you think?