When actually handling, make it a positive experience for the gator. It goes without saying, but a reminder that 30 inch gator large enough to get your attention if it bites you, so be careful. When you consider the investment you'll have properly keeping a crocodilian in captivity, this is a pretty minor expense. Feeding mice is recommended at this size. Fish are ok as a supplement as is beef and chicken.
Mice are a pretty good source for the various nutrients that it needs.
It will let you know if it's being fed enough. As to his temperament, it's hard to say. Sometimes extreme stress can have a paralyzing affect on them. This will help it feel less vulnerable. This will reduce the stress level for the gator.