The best access is to climb Upslope
, head south/left on the doubletrack and right before it heads uphill. You'll see a connector that aims for the carsonite sign at the top of the trail.
Ride this trail cautiously until you get the feel for it. Only a few pedal strokes are required on this entire trail. It is one you'll want to ride over and over again, knowing you can always brake less and go faster.