Just make sure you work out all the details beforehand. Make sure you guys are on the same page regarding who sends what when, what packaging will be used, what shipping service and delivery time, etc....
Finding this out beforehand will help. I had a trade this last summer, sent a guy who lives about 50 miles away from me some Yuma's via Ground. Got there fine, I shipped in a nice styrofoam cooler, etc... He sent back these candycane frags in a PAINT CAN (even though I told him 3 times I wanted the cooler mailed back).
Needless to say the paint can cooked the candycanes like an oven. I'm still mad about it, especially since all I wanted back was the cooler. I told him I'd be fine if he sent back the empty cooler and he never did.
Good luck.