always scope out your path before hitting it if you are inexperienced. ALWAYS, no exceptions. even experienced riders should scope out advanced trails before dropping. i have seen a kid fall 10 feet off of a boardwalk, and break his neck. i have seen a guy come ripping down a boardwalk to a small gap jump, fly off the side of the jump, and smoke a tree at 70 km/h, 20 feet up the trunk. when i ran over to him and asked him if he was okay, he coughed up blood. stick to green trails until you are ready for blue, blue until you are ready for black, black until you are ready for true freeride, etc.
if you are scared of what you're about to do, you shouldn't do it. don't ride trails until you are comfortable with the challenges they present.
and no matter how good you think you may be, get armour. i have a sixsixone pro pressure suit, mace leg pads, oakley padded shorts, local-brand kevlar gloves, pro-tec full-face, the works. i've hit trees at 10k without armour, and it wasn't pretty. i've hit trees at 40k with armour, and came away beautifully. i hate to be a bitch about it, but safety first.