The first thing to remember is that you need to install your toilet in an appropriate place relative to the rest of your bathroom plumbing. Especially if you are installing your toilet along a branch drain, make sure that the sink, shower and any other plumbing fixtures are upstream of the spot where you will be installing the toilet.
You will also need to make sure that you install the toilet an appropriate distance from the wall. You need to be able to get around the toilet, and you also want to leave space so that work can be performed on the unit later. Putting your toilet too close to the wall can cause all kinds of complications in the way the unit functions and there is also a possibility of condensation build-up. For all of these reasons, it is important to make sure you are allowing an adequate amount of space on all sides.
The procedure you will have to follow when installing a toilet will be slightly different depending on whether you are installing it in a new spot or simply replacing an existing unit. When replacing an old toilet, you need to remove everything involved in the previous installation. That means taking the old bolts out of the floor and scraping away any residue to ensure that you have a clean and even surface to begin your installation on.
You should also make sure that you are aware of all applicable local codes before you begin your work. Even if you technically install your toilet correctly, you could run into trouble later on if your installation is not actually up to code. It is also important to remember to level all of your fixtures before you complete the installation process and to make sure you use a dielectric or brass fitting when attaching galvanized steel and copper to each other.