I am a newbie to both FMQ and ruler quilting. My machine is a Janome 8900QCP. I purchased a couple of the Angela Walters rulers, Slim and Taj. I can't imagine using anything longer than the Slim which is about eight inches long. You are trying to hold the ruler down on the quilt top whilst moving it under the foot. It does take a bit of getting used to. This might sound silly but it took a while for my brain to remember to hold the ruler down extra firmly as I start to stitch a line. When I don't do that the ruler foot 'pushes' the ruler out of the way even with the grip dots on the back of the ruler. Next I need to master placing the ruler in positions where I am moving the quilt side to side or towards me. It isn't always easy to see where I am going which means constantly spinning the sandwich on the machine resulting in way more wrestling than just doing regular FMQ. With the Taj ruler I found that my ruler foot tended to 'jump' off the tip of the ruler. Won't be using that until I get a lot more practice. As previous posters have stated that is what it is going to come down to.....patience and a lot of practice.