These stickers are absolutely beautiful. Very high quality adhesive from Avery (leading brand) and they look so nice on the wall. We've used our stickers in our daughter's nursery (see pictures) and they were so easy to put up.
Stick each butterfly onto the wall in the lines you want them to go, with a single, small piece of masking tape down the middle.
Peel back one half of the sticker up to the masking tape and cut away the rear paper.
Attach the one half of the sticker to the wall using a plastic card (credit card size) to get rid of any air bubbles.
Carefully remove the masking tape
Peel the other half of the sticker back carefully, attaching it to the wall using the plastic card.
I hope you found this helpful as I found the instructions to be a little vague.