Step 1: Begin by cutting all 6 sides
Pics include using a RH tilt saw and a LH tilt saw. The good saw was at Techshop, the saw w/o the blade guard was at work. Honestly, Techshop has better equipment than at work. Be sure to use a push stick if your pieces are small.
For newbies, RH tilt and LH tilt describes the direction the saw tilts when cuttng the side bevels (aka miters ... but let's not get all bothered as to which is which).