DO. IT. NOW! Seriously - you've taken a clinic, so there is no time like the present. Jump in with both feet, and you will soon discover just how much fun racing 'cross can be! I tried it without having done any practice, and ended my first season with 14 races under my belt.

As for shouldering the bike - I RARELY do this. It's often not faster. The exception is if you have a very long run through sand... If I am running uphill, I will push the bike, using it as an outrigger. Helps me with traction and momentum, and I don't drop my chain putting my bike down at the top.

Go for it, and have fun!

SheFly