Yeah; it's probably not ideal, but just use your best judgment. I've ridden the trail a few times by myself while Brian was off doing something else, but there are usually people in the area. On a Saturday morning, you likely won't be alone, so that's good.

You might post something to HMBA's forum that say "Hey, I'm a new rider and will be out there by myself tomorrow out of necessity. Is there anybody out there who might be willing to make a lap of Pine Loop with me?"