Either shuttle back up, or be ready for a long grind. A lot of people recomend riding up the road, then back down the singletrack, but I wouldn't advise tackling the technical sections when tired. I usually do this ride as a loop, starting at the butterfly trailhead. This is my favorite ride in the summer months, when the desert riding is to hot. Aside from the 3 mile dirt rd climb and the short paved section, its all sweet singletrack.
Technical sections abound.
On a weekday you can have this trail all to yourself. We usually do it as an out and back starting from the trail head a couple of miles down the control road. Recommend vehicle with some clearance to get down there. This trail head can be hard to spot if you're not paying attention. If unsure of trail head location or driving a low clearance vehicle, start at Butterfly and just suffer through the climb at the end for the first time.