It literelyl takes 15 minutes. You go to Home depot get a good sized one with decent HP. Go home disconect the power to the old one, loosen 3 screws, undo the pipe going to it, a simple pair of pliers works, lift old one up and turn and it comes down. Get some teflon tape, costs $1 and wrap the threads lift up new ones, tighten screws, attach pipe hook up power and done
oh, shut off the water and electricy under sink beofre starting.