Sorry, I meant thinning shears, not trimming.
Unless you want to blend blunt lines or bulky hair, I don't think you'll need thinning shears. I mainly use it on terriers.
Curved shears can be used on any points of the body where there's a curve. Face, paws, legs, to shape tails, ect. If you want to cut or trim her skirt straight, you'll want to use straight shears. I'm not sure by what you mean by 'shape' a coat...