Cageybird, I'm not a professional plumber myself, but I do like to do as many home repairs as I can. From my experience, you can usually do enough research to figure out how to remove the basic cleanout plugs in your house. I mean the ones you can easily reach from the living areas, like washing machine lines and toilet lines. If you know for sure it's a cleanout plug, go ahead and follow the directions in a good do-it-yourself repair manual. However, if you suspect the problem is closer to a main water line or something hidden in a crawlspace, you'll probably want to hire someone who has the right tools and the experience.