Welcome, bro.
You've made a great decision to be bald-by-choice. Suggestion for you: Let your gf give you a haircut (if there is much to cut) & then let her shave you nice & smooth.... Chances are that she'll want to continue on a regular basis to shave your head. My wife enjoys shaving my head when she gets the opportunity. A bit of advice: It is best not to use someone else's razor (purely for health & hygiene reasons) - I would recommend that you buy either plain Bic razors, Schick Extreme razor or Gillette Mach III for shaving your head.
Remember to take pics of the process.
All the best.
