For many new athletes, walking into a box and seeing the climbing rope hanging from the rafters can be very intimidating. For many of us, we had not climbed a rope since high school! Then you look at the white board, and there they are. No worries, you can do it!
How long should the rope be?? For those just learning the skill it is best to have 18"-24" of rope slack lying on the ground. Having this slack allows the climber to get confidence in the technique without being under strain of holding themselves up on the rope.
First, you need to get your feet right.
Pinching the rope properly between your feet is critical to climbing a rope successfully and avoiding unnecessary injury and rope burns. Legs play the bigger role by far in getting the body to the top. If your foot position is wrong, your arms will tire quickly being forced to do the majority of the work.