Preparation Equals a Better Appointment
A bikini wax isn't a spur-of-the-moment decision.
To prepare, you need to trim your pubic hair to about a quarter of an inch (6 millimeters). If you've been in the sun in the past day or two, put off the appointment -- sun exposure can make your skin extra tender and the procedure more painful. You'll also want to schedule around your period, usually the week or two afterward.
A tip from the pros: Take an over-the-counter anti-inflammatory (such as ibuprofen) before you head in. Some people also apply a numbing cream, but as with any other topical skin treatment, it could cause an allergic reaction, so don't go spreading it near your labia without testing it out.