32 years in the plumbing business has taught me a few things along the way. A basin wrench is a necessity when it comes to changing a set of faucets, but is not required if changing a basin (bathroom sink) in a bathroom. There are a few situations where a set of faucets can be changed on a basin with a crescent wrench alone with some patients. A basin wrench does make the job a little easier. On kitchen sinks it is most often required to remove a set of faucets.When making up your sink,faucets,p.o.plug and supplies;it can be all done on the floor, placed in the vanity and supply lines be cut after the sink is in place....Good luck and have a good day....Please subscribe and have a great day.