It is important to not hide anything from the FAA. This seems to get more new pilots into trouble than actual medical issues, at least judging from the content of forums like this.

Google FAA form 8500-8, which is the FAA medical form. Make sure that you understand what they are asking and how you are going to answer. If you run into any speed bumps talk to the Medical Examiner ahead of time or contact one of the aviation medical advisory services and pay a small fee for their guidance.

The actual application is now completed online at medexpress.faa.gov, usually a day or two before your medical.

This is not hard, and you do not have to tell them anything that they do not ask about. But you do have to answer their questions accurately.