Practice is the magic. You can also offer to quilt charity quilts for free to get practice. If you don't have a local group to ask, there is a group that I was getting quilts from (
http://heartstringsquiltproject.com/). They will mail you a top and backing and you can donate the quilt to any group you want.
For free motion quilting, you might want to check out Angela Walters' books and her Craftsy class(Help! How Do I Quilt It?: A Machine-Quilting Manual ). I just signed up [it's on sale] and it looks pretty good.