1. find an aviation medical examiner... here is a good place to start
http://www.faa.gov/pilots/amelocator/2. call the Aviation medical examiner to schedule an appointment
3. go to the appointment and fill out the form they give you
4. Complete the medical examination which is pretty much a basic physical. dont worry about the contacts so long as you can see better that 20/40 with them IN your eyes
5. pay the man
6. take your certificate
7. go home
the exam itself consists of the following more or less... test your blood pressure, eye sight, color vision, depth perception, hearing (he will probably just whisper something to you so pay attention) pee in a cup, he'll listen to your chest take your weight and height, and thats pretty much it.
hope that answers the question