Start at Girdner Trail and head north. A little over a mile down the trail you'll reach a split. Take the left in the Y. There is no trail sign here.
There is a couple turn offs before the Y, but they all go uphill and dead end shortly after you start on them. Western Civilization continues downhill. Take it easy going down to the creek crossing. The trail is steep and a little hairy in places.
Once at the creek bottom, it's uphill to the Cockscomb Trail. Some sections get a little steeper, but it's pretty gradual the whole way up.