Shower fixtures are one of those things that we see every day and tell ourselves that we really need to replace sometime soon. Then as soon as we are out of the shower and on to other things we forget about them.
-Take the old fixtures off. Hot and cold water handles can be removed by unscrewing a set screw on the bottom of the handle and gently wiggling them off. The trim for the handles will just come off when pulled. If there is any old caulk holding the trim on, you may want to go around the outside with a utility knife and separate the caulk from the wall. The shower head can be removed by unscrewing it from the pipe coming in from the wall.
-Clean the stems and shower head pipe threads with a good household cleaner. Allow them to dry and place some Teflon tape around the threads from the shower head pipe.
-Install the new shower head by screwing it onto the pipe and adjusting for proper positioning. Install the new hot and cold water handles by placing on the new trim pieces and then pushing the knobs on gently and screwing in the set screw at the bottom.