As long as you're not dumping the clutch, riding it, dragging, burnouts, and donuts, etc... your clutch will be fine if you stall it.
What I do to practice is to keep heel on the floor with clutch down to floor. Pivot your foot back till you reach the engagement point. At the same time, give it some gas and keep it steady like balancing weights. Once the car starts moving you can fully release the pedal and move your foot back. You don't need to give it gas immediately. Then fully press down the clutch pedal and apply foot brake, and repeat. This practice is done in 1st and Reverse only. Everything else is easy... just remember that you don't need to apply gas immediately after shifting and releasing clutch.
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