What all is required to convert a NEMA 5-20 outlet to a 6-20? I have a 5-20 in my garage (just discovered it under a wall plate....score!!!) that is in the perfect spot for my UMC. What is needed to upgrade it to a 6-20? Isn't it basically as simple as swapping the neutral wire for the other hot wire and changing the plug in the wall? I may tackle it myself (with due studying), but what I'm really looking for is if it's this simple, it should be a $100 job max from an electrician, right? Thanks!