I'm in Olathe, KS.
Two years ago, after finishing framing/electrical/insulation/etc., I planned on taking a week off of work and getting as much drywall work completed as possible.
I had Home Depot deliver my 66 4'x8' sheets in the driveway, and with rain in the forecast for that day, I immediately moved them into the garage, one by one.
Then, I started to bring them down into the basement. The stairway to the basement is one where you go halfway down to a landing, do a 180-degree turn and then proceed down the rest of the stairs. It was very difficult to get each sheet through the 180-degree turn... tight fit, but possible, and very difficult.
By the time I had maybe 20 sheets down there, I was worn out. And this was day one!
My wife witnessed all of this, and happened to be traveling on K-10 later that day when she found herself side-by-side with a plain white van with "Mexico Drywall" on the door and a phone number. She called, and on my behalf, arranged to have someone come out to do a bid.
"Max" came out, took some measurements, and gave me a bid of $1200 labor to hang, mud/tape, sand, and apply the knockdown ceiling texture. They happened to be finishing up a job, and could be out the next day to get started. I said "Sold."
But I had to get all of the sheets down into the basement.
They did hit me up for another $150 in materials for the mud/tape/texture/corner_bead/etc.
They showed up the next day with a crew of 6, and had the entire basement (66 sheets) sheetrocked in 3 hours. The next day, a crew of two showed up to haul off all of the scraps they had left all over the floor. The day after that, a crew of two showed up and spent 8 hours doing corner bead. Then a crew of two showed up every other day for a week to mud/tape/sand. In a week and two days, it was done.
Hope this helps...