If you want an idea of what it takes to build a F1 Rocket, go to my web site. I documented the entire build process from first kit to flying in a step-by-step manner. That should at least give you some idea of the effort and skills involved.
It doesn't take any magic. The skill are common to all aluminum aircraft, but the F1 plans are not as specific as Van's plans. With all the web assistance out there, that's not usually a problem. It will take more effort to build a Harmon than a F1, but the Harmon will be much less expensive to complete. All fly great.
Good luck. PS - about half the F1 builders are first timers, and the rest are repeat builders who usually built a Van's airplane.