After submitting the (lengthy) application form, you are emailed a timed IQ and personality test from HR. After a few weeks, I received an invitation to go interview on-site. No technical questions, just culture/fit questions -- one of the interviewers specifically stated that they "know" your qualifications before you walk through the door, and are only interested in seeing how you fit and operate in a team-based environment. Before the interview they give you a presentation about the CIA and its mission.

I applied online and after a few months was invited to a recruitment event in a close by city, where they held interviews for all types of postions. It was the early morning and they gave a 2 hour talk between multiple people about the process after the interview, should we get an offer. The interview itself was actually fairly easy and simple. It was entirely behaviorial, so nothing too hard to answer. If you actually have some experience in what you're applying for and have some amount of social skills you should be fine.