I'm not a spelling or grammar nazi. Life's too short.
As long as you trust the guy, move forward. Just use caution, ask him questions and demand that he MAKE you understand what he is doing and why. That is part of his responsibility. He's just as much teacher as mechanic.
Never forget, it's YOUR car and YOUR money. Make him teach you. If you can disassemble a human you can grasp the rudimentary functions of the piston driven, OHV, cam in block, pushrod/rocker arm driven internal combustion engine.
Glad you decided to make horsepower. That's never a bad decision in my world.