There's lots of different levels of DYI. If you're a novice that may have replaced a light switch before, I'd be tempted to buy a new GFCI and replace it. If it doesn't work you can return it, if from a big box store and call a professional. Everyone's different. Just find your confort level, and put safety first. Anyone doing even minimal electric work would benefit from a $20 electric tester to confirm the circuit is dead. Good luck