Curve piecing is not the monster some think it is. Anyone can do it......just slow down the sewing....no lead foot.....gently guide the pieces together...no tugging, remember on a bias. I fold to find center on both pieces, finger press that, pin both edges -be they "dog-ears, or regular, and that center and begin....btw you really don't need a special foot....
If it's a tight curve, as in dressmaking, little snips along that curve will straighten it out a bit to make the sewing less likely to get tucks on underside.......