PDCWolf, isn't flying in Space really easy? You think what to do first, point your nose in the right direction and light up your engine for a short amount of time. The real challenge in KSP is to build working spacecraft. And i think once you've learned how orbital mechanics work and have done all the major achievements in the game like orbiting, rendezvous, landing on a celestial body interplanetary travel and such, you are really free to use Mechjeb since you understand KSP.