A small mirror of the kind carried in purses can be helpful in diagnosing toilet clog problems. If the toilet becomes clogged, position the mirror so it reflects up the drainway. Then shine a flashlight on the mirror to see if a foreign object like a child's toy is causing the problem.
Before selecting a contractor for your next job, contact your local or state consumer agency and Better Business Bureau for information on contractors’ licensing or registration requirements and complaint records. Some states require licensees to pass tests for competency and scrutinize licensees for financial solvency. Some states also have a fund to cover some financial losses that result from problems with licensed contractors.