Well, I let my natural shape do it's own thing. I am fine with the arch that nature gave me, but I make sure the eyebrow hairs themselves are not too long (a few seem much longer than the others), and I pluck the underside to make them thinner, and I pluck stray hairs that do not fit in with the natural arch of my brows.
The picture I have on here is from before I did them (and Pre-HRT that pic is 3 years old), so they might look a bit bushy there, but they are fine now.
Honestly brows are not hard, if all you are doing is trying to augment what you have into a feminine look, if you are trying to do something that goes against how your brows naturally arch, that could be tough. Or if you want to shave them off and draw them on, that too can be tough to make it look right.