The Trail begins with a doubletrack (later singletrack) switchback climb for about 2 miles that is narrow in spots. You'll be nearly immediately in tree cover and remain there for the rest of the ride. There are a few very steep and switchback climbs.
After another mile of climbing you'll cross a wooden bridge. Don't be discouraged, what follows is a fast and flowy singletrack descent following the contours of the mountain back down. It's mostly smooth singletrack with a few small sections requiring technical riding skills, but not many.
Watch your speed on the descent as there are some places where you could slide down an edge. Overall, it's a bit more than "Intermediate", but a bit less than "Difficult".
Once done with the trail, follow the fireroad downhill about a mile to the first bridge. Cross that to follow the road (up hill) about 4 miles back to Downieville.