You need a plan. Without one, you'll conk out.
I "trained" in HM for two days prior to my ascent.
Day 1: from the parking lot, Mulkey Pass to Trail Peak to Cottonwood Pass and back to parking lot.
Day 2: parking lot to Cottonwood Pass to Cirque peak round trip.
Both days, I had bkfast and lunch followed by a nap and a hour listening to my audiobook at HM. Pretty sure this greatly helped in acclimatization.
My ascent was on 8/14. Other than the expected fatigue, it was a breeze.
Never even considered taking Diamox. And I am a 47 y/o guy with a desk job.
I prepared a year ago running 5K and 10K three times per week. Lost 20+ pounds in the process.
Again, have a plan. Do NOT just show up thinkIng you'll show the mountain who's boss. Wrong attitude.
You're smart. You can do it. But don't overdo it befor your big day. Save your strengh.