I used simple grinding disks along with metal grinders to take bulk metal out then the stone disks to smooth it. Used a small 12" bit extension with a sleeve of electrical 1/2" tubing that the bit extension went through to hold and place pressure on the bit (sideways) while grinding. That way it's not just the drill you're holding which is much harder. As for how to's, you'll need to use the search function and google. There are lots of how to's. Check porting vid's on heads and intakes too to get an idea on what you should be doing if never tackled a porting job before. It is rather simple though, just go slow and take a little at a time, don't try to rush it.
