It is easier for me to FMQ without trying to follow lines exactly. I use the golden threads or tissue paper if I want a certain design placed just so. It allows you to kind of follow the pattern but you don't have to be too careful because you are going to tear off the paper. If doing feathers I mark the spine and do the rest freehand. It also helps if you can do a certain design following the seams as a guide like orange peel pattern.