This year the PPA will have wave starts and you will be placed in a wave with other runners who have a similar qual time. That is an important feature for first time PPA runners. After the start, just kind of hang in your group and do not try to be at the front. The first leg to Ruxton ave has a shallow slope and nearly everyone runs that leg. (The time at the first check point is meaningless, you will be ahead). The next leg starts off shallow but steepens significantly (10%) as you approach the Cog RR station. At that time you should be walking. After Hydro Street, the slope steepens to 15+% and you should be walking SLOWLY (~2.3 mph). After the first aid station the trail narrows and becomes single file for the next several miles. Resist the urge to pass even if you are feeling strong. Just settle in and relax. This part of the course is a series of north/south switchbacks and you will be exposed to the morning sun from the east. If you are perspiring heavily or breathing hard to maintain the pace with the runner in front of you, that is not a good sign.
As Yoni mentioned, make yourself a pace card (see another post of mine). It will give you a good idea of how you are doing. Most flatlanders will complete the PPA in their marathon time + 30 minutes. I would recommend a 5:30 pace. You will probably be ahead of that pace until Barr Camp and then progressively loose more time above timberline. It will also give you confidence that you are not in danger of missing the cutoff times. Matt Carpenter stresses constant effort (slower on the steep sections and faster on the shallow parts). In one of your previous posts, you mentioned running with a HR monitor. That is a good thing for the PPA. It will provide the feedback needed for constant effort.
The PPA is in some ways similar to a marathon. The last 3 miles (above timberline) are similar to the last 6 miles of a marathon (hitting the wall?), except the PPA gets progressively more challenging with altitude. Glance at the results of previous PPAs and compare the times for the first 10.2 miles to A-Frame and last 3 miles to the top. Some runners do quite well above timberline, while others struggle.