There is a generalized school of thought in maintenance in general, and medicine in particular, that says you shouldn’t be getting to do work you don’t know anything about. You should leave it to the experts and certified professionals. That is a self-serving and elitist view, often driven by fear of liability, that I like to combat.
You are at a disadvantage at first, and may take you longer to get it done, but the next time around you will be way ahead of the experts. Ordinary people can do most technical and skilled jobs, especially now on the Internet era, where instructions for nearly anything can be found with just a Google search.