Thanks for the feedback on the stickers, everyone! I needed a brush cap for my FW so I added on the stickers anyway, and I'll see if/how they work for me.
I also bought a clear plastic seam guide that screws onto the bed and goes all the way from the front edge to the back. I bought it from an online site called Suncatcher. Theirs was less expensive than Nova Montgomery's, which I'm sure is good, too. I'm going to try to put on the sticker, then align the seam guide, and see how that works.
Always fiddling,
Ila