Depending on the shows you are seeing, there is a different approach. (I’m going on my experience as an overly talk and formerly morbidly obese person who needed different accommodations based on the theatre)
If it’s anything in a Jujamcyn or Nederlander theatre, you can easily purchase accommodation seats online and just attest that you aren’t some jerk trying to steal ADA seating for cheap.
If in a Shubert theatre, you’ll need to call Telecharge’s ADA line (212-239-6222) and order through them. Plan ahead by checking the seating map on Telecharge’s website to see whereabout the open ADA seats are.
Since you have the good (mis)fortune of knowing what your physical limitations are in advance, it’s always better to get ahead of it, because if you are planning to see a hot ticket show, they will likely have diminished opportunity to reseat you at showtime.
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