I joined 2002 and ended my military career 10 1/2 years later in 2012. The interview process was not difficult at all, there is a lot of information you will want to get on lock down before you ship off to bootcamp though, so keep high speed and low drag on that.
When I dealt with my recruiter out of Westminster, CA (whose name I will not mention), I was in and out within 2 hours and had made my choice of Rate (Job classification) there on the spot. Military recruiters will ask a wide array of questions covering pretty much anything that will hold you back from being accepted into the military. There IS a level of confidentiality between you as a candidate and the Military Officials you deal with (i.e. Petty Officers, Chiefs and Officers) to where you can count on them to not "skuttlebutt" your information around the work place.
Have questions in mind to ask your recruiter, there are programs that can help you with your candidacy. I used a program such as the Delayed Entry Program (DEP), this helped me in learning the 12 standing orders of a sentry... (the 12th being that my Chief is always right).
For someone fresh out of high school (who isn't a military brat at all), speaking to a military recruiter can be tricky. I would recommend speaking with a veteran, or if you know someone who is serving currently, or who served previously, have them go with you for support if needed.