I would take the head to a shop to have it rebuilt. Taking it off is one thing,but rebuilding it another.
Things to consider:
You need to make sure the head is flat. If not it needs to be milled. A three angle valve job can only be done with expensive machine tools. Valve guides need to be pressed in with some out landished tonnage press. Mike`s ,calipers time and knowelage to do the job correctly.
Leave the head work to a pro, and try the rest of the job yourself.Or you could look for an exchange piece or an after market performance head.
Either way you`ll be much better off with a proffessional job.