Learn how to add an outlet or receptacle to finished drywall walls using three methods: 00:00 Method 1: Behind Baseboard ...

Learn how to add an outlet above or below an existing one without the need for mudding, taping, or painting. This video demonstrates how to run electricity from an existing outlet to a new location ...

You probably CAN do it yourself, but if you're not familiar with the codes, I wouldn't. There are special codes that apply to bathroom outlets (need GFI, as you said), so either study up and do it ...