Stop on a hill, stop the engine, and put it in gear. The truck should start to coast downhill when you push the clutch pedal down. If it does, the clutch is working. If you have a hydraulic clutch, they cause a pile of trouble. If the truck doesn't start to coast, the clutch isn't releasing.
Typically, if a synchro is worn, you can start the engine when it's already in gear, and you can push in the clutch and stand there. When you release the clutch, the truck will move like normal and you'll be able to shift to the other gears. You will likely hear grinding when slowing down and down-shifting back into first gear.
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