Many people try to get out of jury duty, and succeed.
But, ask yourself: if I were the defendant, would I want 'real' people in the jury, or just the dregs?
And I strongly second the advice to contact the Fully Informed Jury Association. They have some really interesting information for free. What you see on TV is not the real deal, and there are quite a few common 'misconceptions' about being on a jury.
Sue