What does it cost to install a toilet?

Changing toilet. You shut off the valve on the inlet pipe then flush the toilet. Now sponge the remaining water out of tank and bowl. Get an old towel to put under back of toilet and remove inlet pipe from both ends. Now unscrew the 2 (or sometimes 4) holding bolts on the base and the lift toilet off the floor. I always have an old cardboard box or similar to sit it on, as the wax seal will make a floor sticky. Remove the toilet from the room to make space for the new one. Fit a new wax seal to the flange on the floor and fit new mounting bolts if necessary. Now re-fit the new toilet onto the bolts and wax seal. Gently rock it to settle the seal down, then fit nuts on and tighten it down. I always fit a new SS braided supply tube rather than the grey plastic junk, this needs no sealant or tape, just tighten the bolts . This is NOT a difficult job, you don't need ANY special knowledge, just common sense.