What starts as a simple faucet or toilet repair can easily turn into a larger project when stops don't work or parts don't match up. Although the initial repair may be simple, trust a professional if it starts going over your head. You don't want to cause more damage than necessary, or become a regular customer at a big box store all in one frustrating day!
Also, keep in mind that your time is money. Would you rather spend 3 hours of your Saturday afternoon fixing your toilet, or enjoy it with family and friends? Calling a professional who can complete the job in an hour gives you more time to do the things you love and need to focus on.