Mazdatrix has a street porting DVD you can buy, it will show you the tools & how to do it. I would suggest having a steady hand & know how to work a die grinder/dremel. You can buy the templates from Mazdatrix or a few other companies (Pineapple Racing & Atkins Rotary). You don't have to port the exhaust, but I look at it like this. If you are opening up the intake why not open the exhaust, the engine will be broken down so just do it all at one time. At this point you may want to look at things like hardened gears, eccentric shaft oil jet mods & anything else that is done when rebuilding.
BTW here's a link to Mazdatrix
http://www.mazdatrix.com/videos.htm