Correct. If the head isn't trashed already, the .018" is just about enough to make it flat, and could yeild a x.1:1 -x.2:1 difference in your final compression ratio which you won't really feel. There isn't a lot of room to cut or you'll cut into the valve seats (and then it really would be worthless).

Always check the head for hot spots and cracks when you remove it. Napa has machine shops all over the place. You can usually just drop it with them and they'll rebuild it for you. They will usually rebuild a sohc cylinder head for about $125-$175. It will come back looking like new. Don't disassemble it past scraping off the vale cover gasket goop, pulling the plugs and removing the sensors if you go that route.

Head bolts are NOT re-useable. They stretch. They'll snap off in your block if you do re-use them.