How to choose the right skill?

It's true that you don't always get what you want, but if you really need something, you can even forget about a skill! Now it's not so scary if you have a mentor! :) But still, you always want all the skills to appear exactly as you need them! But strangely enough, that's almost always the case for me! As soon as I want to develop a hero in a certain way, that's exactly what I get! :)