Don't feel you have to be the only one who knows what to do. There are usually other drivers who are extremely competent both in ability and vehicle. Use them to your advantage.
Try your first trail in a situation where you are leading these types of people. Get your confidence up with experienced people then go to leading others who may have less experience or a lesser vehicle. They will help you get your feet on the ground.
Talk to all drivers individually as much as you can. Seek them out at different times of the day to see how they are going. Ask them how others are doing in the group. Communication and information are great tools to use for the success of the day.
Greg Luer '85 4Runner, '89 FJ-62