From the moment you decide to pursue the certification until the moment you walk from the exam room, eveyone has a different set of experiences.
I found this site rather late in the study process and read messages and experiences about the exam.
I studied for a total of about 8 weeks. That may sound short to some, but I've been doing InfoSec work for a few years now and did not see a lot of stuff I hadn't run across before. The texts I used were the AIO and the Wiley Prep Guide. For my last two weeks of study, I put the books down and concentrated on the CramSession Study Guide and the Transcender practice test. In getting my MCSE, I found the Transcender tests invaluable but think that after taking such tests a few times, you see the same questions and tend to memorize the answers, rendering the test ineffective. With that in mind, I only use them in the final stretch.
The exam was held about 30 minutes from my home. I scanned everything one last time the afternoon before, got a good night's sleep and had a good breakfast, then headed off, arriving 30 minutes early. No last minute cramming in the car as I felt by that time I either knew it or didn't. The exam took me about 4-1/2 hours to complete. I read each question slowly, twice, then crossed out what I knew to be incorrect answers and if needed read it again before choosing the right answer. The worst part was when I found the pages of the exam booklet sticking together and three times started marking the wrong item on the ScanTron. I was pretty much ok through the rest of the test. When I finished, I quickly checked to make sure there were no blank items, checked my info on the sheet, and headed home. Like everyone says, I was wiped out by then!
Yesterday I got the confirming email that I passed.

The only suggestion I can give that hasn't been offered here much is to try and walk into the exam room as relaxed as possible. Don't play the head game on yourself to get so wrapped up in the pressure to the point where you are constantly second-guessing yourself on every question.
Now on to the ISSEP...