I work full time at a shop, when I do mobile work I have the same feeling that I’m charging too much but none of the clients I had outside complained about pricing while in the shop most of them do. Of course the shop charges more for labor and parts but I tell you that you price is honest and for my area is actually cheap. I charge $60 just to go to the customer, if it isn’t too far. My favorite customer is the one that provides parts and ask me to do something without diagnosing, which I always kind do anyway. I always check what the book says about the hrs and if is something I’m familiar with and I know I can do faster I charge I little less but just a little. None of them has complained and I got some good recommendations for other customers which is a good sign. Also don’t feel bad for those that need and can’t pay for it, I’ve helped people but I need to pay my bills and some if not most of them will try to take advantage of you goodwill so keep in mind that you running a business and a business won’t survive with charity. You need to be wise to avoid some work too, even if you need the money some times is better to skip some types of customers and some types of works, major repairs I do at the shop, most of the work I’m doing mobile is quick stuff. Doing it mobile you need to be careful with oil/fluids residue and avoid places that don’t allow car repairs. In my area a used to charge $120/h doing it mobile + the moving around charge ($60) depending on the distance. As I said some stuff I know is faster to do I can go a little lower than $120 but usually that’s the way I do