How to bleed the air out of a hydraulic clutch?

I've got a 1989 half ton chevy pick-up 4x4.
How to bleed the air out of a hydraulic clutch?
Do a gravity bleed to start with. Take the top off your clutch reservoir, then go under the vehicle and crack open the bleeder for the clutch. Keep an eye on the fluid level in the reservior, and keep it filled with fluid. Also be watching the bleeder screw to see if any air is coming out. It helps to put a small clear hose on the bleeder to watch what comes out. When you see only fluid and no more air, close the bleeder and put the cap back on the resrevior. I have done this to my truck before, and I didn't need to do any further bleeding. If that doesn't seem to be sufficient, then get a helper and do this: Have the helper sit in the truck and be ready to push the clutch pedal. Open the reservior as before and make sure it stays full of fluid. Get under the truck and crack the bleeder, have your helper push the pedal, you close the bleeder, and have the helper release the pedal. All pedal movements should be slow and gradual, not fast and jerky. Repeat this open bleeder, push pedal close bleeder, release pedal procedure until you see abosolutely no more air bubbles coming out. Hope this helps.