Brent: From what it sounds like, your mom is gonna be cool with you coming out. If you don't think she'll disown you, then you really have nothing to lose by just telling her. And hell, that will open a whole discussion FULL of education and answers if she has an inquisitive mind! It was tough coming out to my mom but she just asked me lots of accusatory-sounding questions in a somewhat hostile manner and I kept educating and informing her as rationally and calmly as possible. Sounds like you won't have that issue though. Nonetheless, best of luck tomorrow!