I always baste my pieces down and then applique. I don't like pins, they get in the way. Also, I always use a wooden toothpick (wet) to help guide the edges of the fabric under, works like a charm. I recently took a class from Bonnie Sue Haight. Go to her website, Apple Blossom Quilts, she gives tips for applique. She taught the back basting method which I cannot do, I prefer my method. Good luck with whatever method you do.
https://www.appleblossomquilts.com/quilting-tips.htm