If its your first event, its’ a pretty good guarantee that you will be pushed out of your comfort zone in some way. Theres not many sports like it and it will test you at some point on course. It could be how technical an obstacle is, a big fall, mud or how heavy something is.
The bonus to this, is after the event, most people feel great, feel accomplished, like they have been through the wringer, and everything that seemed tough before, isn’t so tough anymore!