A 40m rope is too short. In addition, the type of climbing that you will encounter is very different from the limestone found in many sport climbing areas. There are almost no pockets, but you will follow mostly crags and smooth slabs of pure friction. Because of that, you'll have to use proper techniques. If you think you are a 5.10 climber but are not used to this terrain, trying to lead a 5.10 ow will probably get you in trouble.
Chimneys can also be humbling and difficult to protect.
Knee pads will help considerably here. If you are used to doing 10 sport pitches in a half day of climbing, or climbing twice this number in an alpine days, be prepared to slow down. In addition, the local climbers adopt a quite relaxed style where they take all their time since there is no urge in most cases to climb fast. You'll see for instance that they don't simul-belay their seconds when climbing in parties of three, and they try to avoid overlapping parties. It is often considered to be bad behavior to clip to a belay which is already used by another party, not to mention passing.