DO NOT use the razor you use for your face for... other areas... of your body. Your face has bacteria on it that can spread and cause some nasty rashes elsewhere.
Always make sure to use a fresh razor and plenty of shaving cream or soap. I shave weekly and haven't had any problems.
Also... you may want to consider doing 24/7 wetting only for a while at first... the smell from messing is definately noticable... and let's just say that parents never forget that strained look on your face that says "I'm taking a dump in my pants now, gimme a min."