Help! I gave Mr. Snake extra time with his bad shed (first shed living with us) - about 36 hours or more in total, since he was still making an effort the other night.

Last night, I followed the tutorial (wonderful, thank you!). He hated being in the plastic box, but seemed to appreciate the help with the shed. However, he spent most of the time in the box trying to find a way to get out and his head never soaked. I still couldn't get the skin off his head, nose, and left eye. This is due in part to the difficulty of trying to do it while being gentle and, in part, to his refusal to let me do it.

My question is: should I try again or just leave him alone? Any tips?