It's actually simpler than applying a normal protector. The jig takes the guesswork out of it.
My surface wasn't level when I thought it was nearly lost adhesive over the side and the glass floated when dropped on the bubble and moved up. Good job I noticed and moved it back.
Just hope your note doesn't go back for any repairs as first thing they will do is pull any screen protector off, that's £40 gone straight away!