I went with Skydive Miami (http://skydivemiami.com/). The booking was made a few days before and I showed up on the day for the jump. At the office I first sat through a video informing about the risks involved with jumping and what I will be doing during it. After that, if i still wanted to go, I signed a very extensive contract which said that in case of any accidents, damages, injury etc I could not sue the skydiving company or any one related to the jump. I also filled out a next of kin contact and a statement that I am doing it of my own free will. I would be given the choice to abort my jump up to the moment just before I did it, but if I aborted at such a late time I would just be going for a very expensive plane ride. I paid about $320usd for a tandem jump with free-fall for 60 seconds from 13,500 feet and photos of the dive.
In a back room I was suited up and went over the positions to hold during the jump. I was given a hat that covered my ears, goggles, an altimeter on my wrist and a full body harness. To exit the door I would be standing on my knees and arms crossed to my shoulders. A few seconds after exiting the door he would tap my shoulder and I would put my arms up above my head. The professional diver would be in charge of everything and I would just be there for the ride.