1) Terrain - do you have a sectional? WYS is a bit of a flat area,
almost in a flat pocket (elevation 6600) with a ring of 8K hills about
10-20 nm away in any direction.

2) Are you familiar with the peculiarities of high-altitude, high-density
flying?

3) TFRs at Jackson Hole -- Cheney's there most of August. Be aware.