Okie,
It takes lots and lots of practice! I have a grace frame that I use my Janome 6600. I run my machine at it's fastest speed and then have to really concentrate on not moving it too fast or I end up with jerky, long stitches. One thing you may want to do is get a large sheet from your local thrift store and load it on your frame. Then using a contrasting thread practice, practice, practice. The lady I bought the frame from said she did that and it really helped her.