I took the PE three times:
1st: studied maybe 30 hours aside from searching for references, literally didn't crack a book for the last month - just gave up! Didn't even have more than half the required references. Walked in thinking there's 0% chance of passing--I'll just see what's it like, and walked out thinking, "Dang - maybe there's a chance, wish I studied more." (I missed passing by one question 54/80)
2nd: studied maybe 40 hours more and got all references but one. Slept poorly, never hit my zone during the exam for even 10 minutes, but still felt passing was theoretically possible if I got super lucky guessing, but not the most likely option. I didn't know my references at all and I probably used some of my exam time poorly trying to compensate for that. (I missed passing with a 48/80 score)
3rd: studied 110 hours more, got a hotel room for 3 nights--instead of driving 2 hours prior to the exam, slept great, and felt pretty good walking out of the exam (but not like failing was impossible). I'm currently going crazy waiting on results in NY.