changing your own oil - is it worth it?

For all the work I've done on my coach, I still take it down to the local quick lube joint. The cost is cheap and its convenient. I count the grease fittings and watch them do it. To get the ones on the axle, the coach has to be rolled, otherwise they can not be reached. Its a 2 person job, as one person has to be under the coach, so they can tell when to stop, so the fitting can be reached. I've been going there for over 10 years, they know me pretty well. Its has the cool factor, so they tend to be more careful than their average car.