If you only turn it up a little bit...you wont exactly need a pyro right away, but you WILL NEED ONE eventually. Stock IDI's can hit high EGT's....stock, so even turning it up a little bit can and will set it over the top.
Watch for black smoke, lots of black smoke equals high EGT's. I wouldnt go WOT for more than 15 seconds without a pyro, from a stop. Pulling, dont go WOT for more than 10 seconds. I think this will keep you on the safe side.
But you are gambling an engine, and you can still melt it down.
Nope, take the side cover off. With a flashlite and mirror look for the set screw....and have someone underneath with a 15/16" socket/wrench and turn it over until you see it. No it wont mess up your timing. Dont go over a flat without a pyro. You wont need to time it afterwards, just put everything back together and away you go. Start it up and be ready to give it some throttle, cause it will try to stutter and die on you.
Good luck, and I hope you dont melt it down