Glad to see someone already answered. Yes, IST is the one you really need to worry about. You'll still be possibly in shock, dehydrated, and sleep-deprived. If you don't pass the IST, you roll right there. If you do pass the IST, odds are you shouldn't have issues with the In-PFA unless you somehow get injured between the two. Mid-PFA requires an average of 'Good' overall. But that's not until week 8 (gauntlet week) and will probably be the least of your worries. If you don't struggle with the IST then odds are you won't have any issues going from SAT -> GOOD by week 8 when you PT 5 times a week. I would definately recommend achieving at least an average of GOOD before you check-in. You probably perform lower than your norm/best when you do the IST. Everyone performs less than they usually do. My candio phase can be defined by one word. 'Watch'... At one point, I stood 32 hrs of watch in 48rs. On top of having to get pictures done, attend briefs etc. I averaged 2hrs of sleep during indoc week as a candio. Not 'terrible', but still...pretty sucky.