A lot of people say they are just going to watch first. You're already driving out there and spending all the time there. Might as well bring your gun and shoot the match. You won't gain/learn anything by watching first anyway, so you might as well shoot. There will be PLENTY of time to watch every single other shooter all day.

If you show up early and help set-up, you'll know the course better than everyone else because you personally set it up (plus a lot of clubs will give you a discount for helping, if they don't already let you shoot your first match for free). Finally, once things get started, just ask them to place your sheet toward the back so you don't feel rushed. I see some people noticably shaking on their first stage. By the end of the day they are perfectly calm and discussing strategy with the other shooters. Come to think of it, I don't think I've shot a single match in over three years that didn't have first time shooters there, so it's not like you'll stand out.There are usually women at every match as well.

Good luck, let us know how it goes.