I've scheduled my first 4 hands.  Any suggestions on how to make the most of this experience?

If not, suggest they get together before for... “coffee”.  One of the best 4 hands I ever had was with two ladies who’d never met, but I thought they’d be great together so I suggested the 4 hands to them. They agreed to meet for “coffee” to get to know each other.  In the end, I had a great time and they did also (I think they’re still friends).

I'd add that I think it helps if the client has seen both providers before as well.