Thanks all!
When I registered as a novice, I did request and paid extra to have an instructor in the car.
While obvious now, I didn't previously connect that a lot of the autocrossing techniques (look ahead, both feet in for a spin/off, etc) are also integral to HPDE
I will keep an eye on brake fluid, and depending how it goes Saturday, will make the switch to higher temp before the next HPDE event I am scheduled to do in June.
Also, did get track day insurance. While not cheap (4 events through Lockton with 37k agreed value of car and mods), it is a hell of a lot cheaper than writing off and rebuilding my car.
Misses is bringing up her F56 JCW as a support vehicle, and we plan to pack plenty of fluids and snacks