To remove and install a bathroom sink drain pipe, start by turning off the water supply and placing a bucket underneath the drain. Loosen and remove the old pipe by unscrewing the connections. Install the new pipe by securing it in place with the appropriate fittings and ensuring there are no leaks. Turn the water back on and check for proper operation.

Removing and installing a sink drain pipe involves disconnecting and securing new fittings. Benefits include improving drainage and functionality. Challenges include ensuring no leaks and proper fitting. Effective installation ensures reliable sink operation.