Lumberjack is a blast. It's not a technical course but it is mostly singletrack. Rolling terrain so momentum from downhills help on the uphill. I've done LJ100 three times. Other 100s include Cohutta and Mohican. Work toward back to back long weekend rides. Practice / learn what fueling and hydration works for you. Many DNFs on the 100s are from issues eating / hydrating. Overall endurance is a goal, being comfortable on the bike. A real plus to the LJ100 is that you can see familiar faces in the pit twice during the race. If you're fit and ready to rock this event, ride the first hour to two hours at a solid to near XC race pace, then settle into a sustainable high-endurance / low-tempo pace for the balance of your race. Ride w/in yourself. Be present on the trail and constantly attentive to eating, spinning, riding the trail. It's a fun day.