They should be fairly easy to do. I've never had I change mine so I'm not familiar with the procedure but I don't see it being very difficult. I would do it myself. I don't see the point in paying $100/hr for labour when I can do pretty much all basic mainentance myself. The cost of tools is offset by the savings from not paying for labour. The only things I don't do myself is stuff that requires the car to be on a lift.