Begin by ensuring your safety and preparing the work area. Shut off the main water supply to your home. Open the faucet at the tub and a lower-level faucet to drain the lines. Use a utility knife to score the caulk line between the old tub and the wall surround. Remove the faucet handles, escutcheons, and tub spout. Disconnect the drain linkage at the overflow plate. Next, you must expose the tub's flange by removing the wall material (tile or surround) at least 6-8 inches above the tub deck. A pry bar, hammer, and reciprocating saw may be needed. Finally, disconnect the tub's drain from the P-trap, which may require cutting the pipe. With a helper, carefully pry and lift the old tub out of the alcove.