The best wrestling tip anyone can give you is to always try to massage your opponents genitals while on the mat. It throws them off. Try it and let us know how it goes.
You need to take the experience you received this summer getting poked in the ass repeatedly by the guy who sold you the gear. Just apply some of the techniques he used to restrain you and you should be set.
Also, I think you'll find it beneficial to try and maintain and erection during your match while wearing that skin-tight wrestling get-up. In fact, you may want to consider cutting a hole in the genital region of the uniform. This will allow you to efficiently use your erection as a poking device. Go for his eyes dude.
Oh, and one last thing. If you can urinate in your uniform just as you begin the match (make sure he sees you do it), you'll be giving yourself a huge advantage. Guys don't like to grapple with people covered in urine. Trust me on that one. Hope that helps and good luck.