I would go after it as follows:
1. Check neck relief - you want to push low E string down at the first and last fret, simultaneously, and have just a little space under the string at the 12th fret. Doesn’t take much, just enough to be off the frets by the thickness of a heavy gauge pick, or two. Season to taste, or if you get a lot of string buzz. This step might be all you need, it often is for me.
2. If your action is still high, check your trem plate from the side - lay the guitar flat on a table, and look at it so you can see if the trem plate is angled away from the body - it should be level (parallel), not necessarily touching the top. If it’s angled up, tighten the screws that hold the trem claw until it’s level (re-tune, re-adjust until you get it level at proper tuning).
3. If you’re still high, move your saddles down by turning the hex keys counterclockwise. Start at the high and low E strings, they bottom our first, and that way you’ll know how much room you have to play with on the others. I don’t worry about a string radius gauge, you certainly can use one to match your fretboard radius, but I usually end up deviating slightly from exact anyways, most of the time you will want the bass strings a little (very little) higher.
4. If your action is STILL high, next step is to adjust the bridge itself. You will need to loosen the strings and remove the claw springs so there’s absolutely no tension, or your mounting screws can break when you turn them. I like to, and recommend, just taking the strings off when you get to this step. The lowest you can go is to have the trem plate decked, right flat to the guitar body, although I think with the precision of PRS build, that extreme is rarely necessary. Use some playing cards (or similar), before you detune or remove strings, and see how many fit between the bridge plate and body. Then decide how much you want to take the bridge down (half as high, 1/3, whatever) after you remove the strings and springs, put that many cards back under, and put some light adhesive tape over the cards to hold them in place on the guitar top. Then you can drop the plate down on to the cards, and screw each mounting screw in just until it barely starts to lift the back of the plate up, and back it off 1/4 turn. I know that part sounds counterintuitive, but if you do it, you’ll see what I mean. When you’re done, look at them from the side to make sure your screws are level, and your knife edge is in the notches of the screws evenly on each screw. Voila. The John Mann trem installation video is a great resource for this part, too.
I might be dumbing that down beyond what you need to do the job, but I hope it helps. Fancy tools are nice to have, but not absolutely necessary, I have one of those 6”, stainless precision rulers, and that’s all I need to do my setups.