Overheating can be due to low coolant, air in the coolant system, damaged head gasket, bad thermostat, clogged radiator, bad fans, damaged water pump or any number of things that are difficult to troubleshoot without looking at the car. I'm willing to bet it's a combo of some of those I mentioned. The fact that your AC keeps cycling leads me to believe that this is fan related - I had a similar problem with one of my Civics.

Why the necessity for a certified tech? It's a 1999 Honda Prelude not a 2012 Ferrari 458. People with that level of experience don't troll around forums looking for piecemeal work. They either have their own shop or are employed (and handsomely paid) by a dealer somewhere. You're better off taking it to a shop that offers a warranty on their repairs - it should be a cheap and easy fix. Good luck man.