I'm new to sanding. I've always wanted to try, but as a single mom I never had the time. I even had a specific project in mind. About a month ago I finally made up my mind and decided on a grinder. Now, being someone who had never done this before, I had no idea what I needed or didn't need or anything. So the one I ended up working with works, but it's just circular so it's impossible to hit specific spots with it. So I finished most of the project I had in mind, but it still wasn't finished…