I also recently purchase Leah Day's quilting stencils. I used masking tape to apply them to the top of the quilt. I had a hard time following the stencil lines smoothly, although this process does have some potential. I just need more practice with it. I did one row across the middle of the quilt, but ended up removing the quilting stitches and doing straight line stitching.
As far as basting, glue basting rules!! I wish I had learned this sooner. Watered down washable school glue works well, but can be a little messy (maybe it's just me). I love using 505 fabric glue spray- it works really well for me. But I need to take it outside to spray on my long 8 ft Costco table. Using pool noodles works well for bigger quilts when spray basting each layer.