Sit start on great holds in the low hueco on the overhanging tallest part of the boulder. I went pretty much straight up on slopers, most of which have a little bit of a positive edge. Guidebook says to go up and right. Either way, getting established out of the hole is probably the crux.
This problem is in the "main area" of Kelly's Hill. When hiking up to this area from the main trail, you'll see the boulder with Jump Start on your left and the obvious striking prow of the Johnnie Big Mouth boulder on your right. Good map in the Bob Banks book.