pitchtrim
If you search on this forum you will find desciptions of the procedures.
I would recommend going to the CAA. I found them to be very fair, and it's free. You will probably have to walk on their treadmill so it's worth going to the gym, if only to get the legs up to strength. I did 14 minutes at up to 16 degrees before they gave up and sent me home with the full medical (I had ectopic beats).
Whatever you decide, I wish you luck. The apprehension is worse than the actual experience.
Airclues