I love sewing curves & circles! I have the curve master foot, but do it without them now too. I believe in the back of one of the books I have from the place that sells the DP templates, it showed where she sewed a small DP quilt, & did the blocks by machine, no pining, & they came out perfect. So I started doing it that way & no problem. I have pinned them, & also used the foot, so I think it's just a matter of finding what works for you. I did try the foot first time & had trouble with it, then I realized, you have to practice on curves too, not just straight seam scraps, lol, so keep that in mind too...... Any of these ways take practice, so be patient....
Elisa's Backporch quilts is the website, I think!...