I'd start getting a little practice where ever you can on dirt and small rocks. For the trip, you will want to air down the tires some for better traction and take your time going over. For the altitude and carb, most carbs tuned in their area are good for 5 thousand or more feet altitude. No way of really telling till you try it. So sea level to 5 thousand feet, you will be ok, after that you may notice some lack of power though.