One thing nobody has mentioned is to make sure you spin your tip against the port edge so that it is turning into the nicasil. DO NOT SPIN YOUR TOOl TOWARD THE BORE! It will definitely up the chances of flaking. In my experience with playing with porche motors the Nicasil is pretty tough stuff, but the weirdest things can cause it to start peeling.
Yeah it is ideal to send it to the sponsors, but I always encourage any one with the balls and proper equipment to attack a project. Just as long as you are willing to pay for a mistake if it goes awry, go for it. Let us know how it goes.
Again, all you guys who refuse to believe that it is possible to learn this shit. You are nuts! Whether it's automotive, construction, or our banshees, it is important for people to learn how to do this shit or in the future we are fucked! After all, every builder has many dollars tied in to "Sacrificial Research". It's not like these guys just picked up a set of cylinders and was banging out flawless work and became a site sponsor overnight.