Practice! I love zippers and they are also very intimidating. You can install a regular zipper with a normal foot, but if you want to master invisible zippers (and also learn to sew on lace, sew over beading, and do other magic sewing tricks), get acquainted with your zipper foot will change your sewing life. I recommend Youtube for good videos you can sew along too, especially for trickier types of closures like hidden zippers.