Specifically looking for drills, input in any way.
Several years ago saw interesting drills thought I'd pass along. Not sure with this age bracket but clever ideas and they could work with a litle modification.
1. Infield practice without a glove fielding tennis balls hit with minimal force. They'll instinctively start using two hands without being told and not be afraid.
2. When comfortable, with glove hit a little bit harder until they are comfortable using 2 hands with glove on.
3. Next phase when comfortable is hit a little harder, fielding with 2 hands and glove, while having a coach beside you hit an aluminum bat with a tack hammer each time you make contact with the tennis ball. The kids will associate a sharp noise with an incoming tennis ball with speed toward them that they've proven to themselves they can handle without being hurt.
Back to watching it snow...