Bf insists on getting me off from clitoral stimulation

Okay so my bf and I have been dating for almost 4 years now and he's never been able to make me orgasm. We're long distance so we really don't have much time to mess around. I'm seeing him Friday and he insists on getting me off. He told me to just guide his hand and show him what to do. Any tips or tricks that may help? He's really hoping that it works! Please help!