It's an acquired skill. I haven't acquired it yet! :D
Set up some practice quilt sandwiches and try it out. I've only done it a few times and I'm getting a bit better. It also helps to go back to your practice piece and "warm up" a bit each time before you go back to your project. I'm going to set up a larger practice sandwich with muslin (about a yard long or so) and keep practicing bit by bit...when I fill the practice up, the dog will get a new cushion cover for the old chair she sleeps in! Little expense, no real waste.