Replacing a sump pump is fairly simple, I advise not buying a sump pump at Lowes, They are cheap in price and quality and you will probally be replacing them again in a few years, Make sure the sump pit is not full of rocks, most likely the pump you have sucked up rocks the impeller couldnt turn and either burned the motor up or will keep popping your breaker. Use a 1/3 hp not a 1/4hp and try a cast iron pump not plastic with thermal overload protection, The electric is simple they just plug in, The plumbing part is about 15 minutes, Cut the discharge line, unplug the pump, Unscrew the discharge line and screw into the new pump ( you need to know if it is 1-1/2" or 1-1/4" most sump pumps are 1-1/4") Glue a coupling on the discharge attached to the pump,set the pump in the pit and glue the other end of the discharge, Plug the pump in. It should take 1 hour for both pumps.... Good Luck
Zoeller M53 Mighty Mate Iron Body, Poly Base Automatic Sump Pump 1/3 hp