For Mint Sprint, starting with the centre stroke, I touched the brush down a little further away than where I intended the polish to actually start, and pushed the brush slightly back towards the cuticle to create the rounded edge. I completed the stroke by pulling the polish to the nail tip. Then I just followed the rounded shape created to do the side strokes. You're sort of doing this as if your cuticle starts a bit further up than it really does, and yes, it's that simple.
Will you be trying the ruffian nail? What are you up to this weekend?