Toilet installation is doable for people with a handful of basic tools and some limited home repair experience. Manufacturers, hardware stores and other outlets often provide basic installation instructions. Make sure to always turn the water off at the supply level before beginning removal of your existing toilet. Replacing a toilet will also involve some heavy lifting, so it might be advisable to have a partner help out. Of course, there are situations where it might be better to have a plumber help with the install of your new toilet. If you are installing a specialty design, like a wall-mounted toilet, then installation can quickly get too complicated for the average DIY-er. People with old homes might also want to consider a plumber, since they may encounter plumbing or old installation methods that don't match with contemporary toilet install instructions.