As someone doing the FPP for TSC prep, I would say that you simply must do the FPP in a GTG format. I don't think this is optional; even 5mins of rest between sets is too tiring.
As an example, today I did a set of 8 when I woke up, maybe half an hour later, a set of 7. I'm at work now, so this evening I'll do sets of 6, 5 and 4 with at least 15 minutes apart.
I'm on my second week, and last Monday I tried to do 6,5,4,3,2 in one session with 5 minutes of rest between sets, and I was still sore on Thursday morning (I GTG'd for the rest of the week).
Please take this advice seriously, especially if you hate soreness like I do. I've no doubt that the program works the wonders that it promises, but I think it will only work provided all reps are perfect and performed while fresh. GTG guarantees quality and freshness.
Also, start modest. Test your max reps, and take off at least 3 to decide where abouts in the program you should start.