If you're playing with starter equipment, do your average and pride a favor and don't enter. I took a shot at it with starter equipment (outside of a gifted driver), and it was ugly.
Some of my avg stats before the round were: 72.51 scoring, 82.62% driving accuracy, 55.56% GIR, Avg to the pin. 22 ft, Avg putts 1.83. So I'd consider myself a decent, but not good, player.
I shot 52-45-97 (+27) featuring 4 pars, 8 Doubles, 1 Triple, and 1 Quadruple. Hit 79% of the fairways, but only 28% of the GIR. My average distance to the pin was 21.8 ft, and it took me 2.56 putts on avg. to get in (including 2 1-putts, 5 3-putts, 2 4-putts, and 1 5-putt).
Oakmont makes Bethpage look like another St. Andrews.