Climbing Chachani Tomorrow

It´s all set, I am starting to climb Chachani tomorrow (Tuesday). I am going with an Italian guy, and the guide. We get picked up at 8:30am in the morning, and drive to the Volcano, we then walk until we reach base camp which is at 5325 meters and put up our tent. We have some food and then try to relax. Apparently it is impossible to sleep because of the cold. Between midnight and 3am on Wednesday morning we will start the final 7 hour climb to the 6090 meter summit (i thought it was 6075m, but apparently not). There are four big traverses where we will be using crampons, and the ice axes. You can´t carry much except for water (5 litres), but I´ll take the camera and try and get some shots of me at the top, although most electrical stuff doesn´t seem to work at altitude (My ipod hasn´t worked since Santiago). I´ve been given some ridiculous clothes to wear, and a pair of walking boots that look like school shoes.
I´ve heard from a few who have tried it that it´s the hardest thing they have ever done, physically and mentally. I´ll give it my best shot, but I reckon its going to be a wicked experience trying to make it to the top.
Laters
Chris