I did it in 2015, we went out the week before and got a chalet between 8 of us in Alpe d’huez which cost under 200 each. The entry fee was about 90 euro at the time and that got you the lift past for the week before to do other runs there and practice the course. We also went over to Les Deux Alpes for a day which again was cheap on the the lifts.
Qualifying was on the friday (I think) and depending how you did meant you were either were racing on Saturday or the Sunday, The qualification course is different to the main race and considerably shorter. I cannot remember what gets you in what race just that it’s great fun and a great experience.
The riding I enjoyed especially the glacier slide and the technical bits which I did not find that tough its more the number of people trying to get down them. It was incredibly hot as well 40 degrees plus and staying cool was a challenge.
I enjoyed it and am hoping to go back in the next couple of years for hopefully a puncture free performance.