All the Boot Camps are hard, that's why it's called Boot Camp :)
Just try it out, you have a whole week of free sessions to try different Boot Camps and different trainers.
It's great to be in the fresh air, get pushed hard so you will get fitter and stronger.
You feel better, you have more energy and the daily activities might feel suddenly easier as well. Working out in the fresh air is very essential to your mental health.
Winter: make sure to wear enough clothes, gloves and a hat or something for the head.
Summer: make sure to take water with you, also might bike gloves if you don't want your hands to get to dirty.
For the evening: make sure to eat something small with full of energy like a banana for example.
Advanced BC is a running BC, so at the end of the session you are again at the starting point. Try to just take the essential equipment like phone, keys and money.