Need help/tips for bleeding clutch

I have a 87 Hardbody, 4 cylinder, 5 speed. I had to change the slave cylinder on the transmission, but now I'm having trouble bleeding the clutch system. There is a bleeder screw on the clutch damper, I did that, and then I moved to the bleeder screw on the slave cyclinder. But I still can't get it to work.:banghead: :screwy:
Anybody have any tips?