The stickers are quite curved
I attached the guides to my fingernails once I had painted a base coat, two layers of ELF and one of the top coat to help the polish dry quickly
It wasn't to difficult to attach them, and if you misalign them they can be peeled off and reattached and are still sticky enough to be effective. You will need to paint a thick layer of the tip colour, then as soon as you have done that peel off the sticker. This will give a really distinct French nail line.
Once you have done this it will look a little like this
After a quick clean up and another layer of quick drying top coat;
The smile lines don't look too curved on the nail