I found that cutting on the fold gives you a lot of hearts that are nice and symmetrical all at once.
I cut the white paper into squares and used a sponge brush to apply glossy Mod Podge directly onto the vase. My helper put each piece in place, then I went over it with the sponge brush to make sure all the edges were down.
Little Crafter loved this part best. He decided we need to make more…which I’m sure we will.