Okay, I did, the secret it, it's 10 % Prep, 5% Skill, and 85% Patience... I knew what angle I needed on my miter saw but my circular saw protractor (?) isnt reliable so here is what I did.
I cut a piece of 2x6 and made a stencil with the angle I want.
Then I put the circular saw inside the stencil
and three hours later and four mis-cuts later...
Viola!