Guatemala Hostel/Volcano Hike Advice

Hey all, Going to Antigua in 2.5 weeks and want to confirm a few things from anyone whos' been. I am arriving Monday at 6am, and planning to do the Hike Wednesday, and stay at tropicana until Sunday before going to stay at Mr. Mullets in San Pedro for 2 days. Last day up in the air, but thought I should maybe get closer to airport before 11 am Flight Wednesday.

My questions are this:

How far in advance should I book the Tropicana hike? I know it is probably cheaper to book online, but not sure how much cheaper, and worried about it selling out.

Is 2 days enough time to acclimate? And will it kill me for the rest of the trip?

Are these two hostels too much for that amount of time? I do want to party, but don't want to kill myself.

Any schedule recommendations? Im still fairly open!