General Anesthesia, in most cases, is used only by licensed and highly trained physicians during moderate to relatively major surgical and invasive surgical procedures (or per patient request in some cases). General anesthesia should NEVER be used without proper training and monitoring equipment. Serious, life threatening, reactions to general anesthesia are not unheard of. In rare cases, reaction to anesthesia can be fatal, even in a monitored hospital setting.
In addition, there is no procedure that you should be doing in a "home surgery" context that requires general anesthesia. If you want to experiment with general anesthesia on a recreational level, you can contact kinky medical professionals through heavy S&M clubs.
Local anesthesia, if any, should be the only anesthesia ever utilized for body modification purposes.