Being a little nervous is good. Over confident or scared would both be bad.
It's mostly common sense stuff. Maintain the equipment and don't push it past its (or your) limits. Drive slower than normal, leave more room than you think you need to between you and the vehicle you are following, slow down for stops sooner than you think you'll need to, take corners wider than you think you need to.
As you drive it more you'll gain experience and you'll figure out how cautious you actually need to be. Just over-do it a little until you find the new balance.