I second mfox. Shave as close as possible, and as close as possible to the appointment time... Like, I'd probably shave about an hour or two before if your appointment is first thing in the morning. If you actually get a 5-o'clock shadow though and your appointment is after work or late afternoon, consider shaving later in the day (at work? ehhhh) or shaving again before your appointment. My facial hair doesn't grow very fast. Used to take about 2 days to get a 5-o'clock shadow, haha, so shaving the morning of an afternoon appointment wasn't an issue for me.