Well, you just list the ones you want, but at this point if you are under level 9 you mostly use 2, and above you can use 3 at this point in time
You can't be higher than level 10 at the moment at this stage.
There is the ability to swap out your skills. Because you have a limited number of slots, be aware which ones you have equipped during certain times, if I see something odd, I will probably make note of it and tell you about it here. Just like Jangel and his level 5 from inefficient number of enemies killed.

Edit: Yes, yes you did say cutting