This trail can be accessed from Grater Rd on both ends (on the east end you need to grab a short connector to hit the trail from Grater). Silverfish itself is pretty easy to follow, and meanders around some low-lying swampy/marshy land.
Coming from the east, the trail stays fairly straight for a while before the real twists start about 1/2-3/4 of the way through. Nothing too tough here, but it's not a green cakewalk either. There are some nice off-camber sections that probably require a bit more attention for the average rider.