If you really want to do needle turn appliqué than start with simple shapes without too many tight V shapes or points. Although it is tempting to leave a large turn under, a 1/8 of an inch is generous for needle turn appliqué. I found having a backboard to work on helpful. I cut a ceilng tile into a 12 inch square and used it to pin the top of the background block onto. It leaves the body of the block free to work on but keeps me from scrunching the block up when needle turning. When I scrunch the block up to work on it without the board, my appliqué gets off center and wonky. Start with a small project like a pillow top and do it to see if you like the technique. If not, there is no reason you can't do beautiful appliqué work doing the wonderunder fused technique. I did one beautiful floral bouquet pillow top and decided I would rather do fusible appliqué but if I ever want to do a needle turn project, I am confident with the technique.