As Werdna's post.
I too realise that for lots of people, simply taking a wheel off is beyond the scope of their ability and I don't say that with an ounce of malice attached. One of my work colleagues the other day asked me if I could re-inflate a front flat tyre for her and on realising she had a puncture, she admitted that she wouldn't even know where to find the spare wheel. I've actually taken the time to train/supervise my own wife on how to change a wheel. If one is able bodied and confident, it isn't rocket science.
Front brake discs/pads, especially on a 500 are relatively simplistic and a competent home mechanic can achieve a pad change in just 30 minutes per side. The last time I changed the pads on a 500, I used genuine Fiat pads @ £25 the set and of course fitted them myself, saving anything from £50 to £75 on the whole job. At just 20 quid a pair for a replacement set of front discs on a 1.2 for example, we're not talking big money here. Even on a large car like my Saab 9-3, I've just replaced the rear discs and pads on that myself and the whole job cost less than £50.
Garages can and do make big money out of people for easy service jobs, but then they are of course businesses, trying to earn a living, pay for premises and staff and the good ones offer the best service they can and of course some peace of mind for those folk who don't know the difference between a pollen filter and an air filter.