Everything? Just the head. So they were gunna P&P it, Oversize your valves, Upgrade your springs and install it all and press in a new cam? What cam options did you have.? Or did that include Jug work as well? (Bore, hone and piston) That include new gaskets too?
You can do most of an engine build yourself if you are somewhat mechanically minded and depending on what your doing. HD springs and pressing the cam bearring usually need to be done at a shop, along with a proper P&P and overvalve job. Bore and hone on a jug needs shops tools as well.
Sounds to me like you need to do some research first. There is tone of great info on this site. Take a look around.