Even if you're comfortable, practice starting out on level ground without any gas. It's a real skill builder. I guarantee it will help you on inclines.
I remember teaching someone who, for some reason, was under the false impression that once the car started moving he had to commit to full engagement.
Learn to modulate the clutch by itself to keep the car from stalling. That's the value in practicing a no-gas start.
I'm sure the car is fine. The clutch will get mushy on engagement when it gets too hot. It's the same as brake fade only different.