Question for the coach.

I'm column 1, can hardly do a full one. I'm getting to the point that I can do the full ones until my nose is about 6 inches from the ground. Can I do these 'halfway' fulls?
And, sometimes when I just don't think I can push back up, I lower my knees just for a second to get me moving back up. Can i do these 'halfway' fulls?