Adam,

Patience!

I take my son out often who is also ten years old. You have to keep in mind that the skills that you have learned are not embedded into your nephew. I started out with my son by spooling a reel and explaining to him what the backing was, fly line, leader, tippet etc...

Choose a place to fish that is wide open if possible, make it fun for both of you and don't expect to fish yourself. I find that I stay relatively busy with helping my son. If you do end up making a few casts and get lucky enough to hook a fish; let your nephew try and land it. I find that I get more enjoyment out of watching him with a fish on then I ever have had landing one myself.

I hope you both have a great time and re-post after the trip.

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If I can't fish, I may as well go to work