I think your gear is going to depend on you. I use trail running shoes. Saucony Perregrines, which are always cheaper if I buy last year’s. Any boots I’ve ever tried just feel heavy and make me tired. But some people need or like that heavier boot for various reasons (ankle support and bottom plate). You know you. I do recommend poles if you’re new (or very excited :)). I fell coming down Wilson because of the loose rocks and I used mine the rest of the way. When legs are tired, my body won’t recover with balance as easily when stepping on loose or slippy terrain. No need to break the bank on poles. I have friends who got some from Costco. I got mine off Amazon for like $35.
Water and snacks are essential. You’re going. To burn a couple thousand calories or more on these hikes. You don’t want to hit a wall and not enjoy the hike anymore or be unable to get back home. I bring a 1.9 liter water bottle in my pack. Sometimes it’s for drinking. Sometimes it’s to rinse off your shin when you went a little too fast on your descent. Plus I have it if a hiking buddy runs out. I usually pack a Honey Stinger just in case I’m feeling like I’ve burned too many calories. Bears are out so a whistle or horn. And a shovel and basic first aid kit. I’ve only ever needed the alcohol wipes and bandaids. Emergencies can happen along with tummy troubles.
I always tell my partner where I’ll be, approximately how long I’ll be gone, and I wear a Garmin watch which has an emergency alert function. AllTrails I believe also has a tracking function you can share your location with someone. But the peak challenge peaks are fairly well trafficked. I’m not worried on those of getting lost.