Turn off the shutoff valve on the water supply line. Flush the toilet -- that empties the tank and the bowl -- then sponge them both dry. Disconnect both ends of the water supply tube at the shutoff valve and at the toilet tank.

Use a ratchet wrench or a basin wrench to remove the nuts from the mounting bolts that hold the tank onto the bowl. There will be two or three of them -- one on each side of the tank, and maybe one in the middle. Carefully lift the tank off the bowl and set it where it won't be in the way.

If you still have trim caps on the floor bolts, pry them off and then remove the nuts from the floor bolts with an adjustable wrench. If the nuts won't budge, try spraying them with penetrating oil. If that doesn't work, you may have to cut the bolts with a hacksaw or split the nuts with a nut splitter.

Underneath the toilet is a wax ring that seals the bottom of the bowl to the toilet flange -- that's the end of the drain pipe. To break the seal, you'll have to straddle the toilet and gently rock it side to side. When it's free, lift off the bowl, then lay it on its side nearby (but out of the way).

Use a putty knife to scrape away the old wax from the toilet flange and the bottom of the toilet. Line a bucket with a plastic bag and throw the old wax in it. Clean the flange and horn with a stiff wire brush.

Right about now you'll probably be smelling something pretty strong -- it's sewer gas. To keep sewer gas from entering your home, stuff a rag into the hole. Cover the flange and rag with an inverted bucket for the time being.

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Installing a Toilet