It was a little tricker to put on the wall than I expected. Each colour is on a separate sheet—so you have to place each colour on the wall one at a time. And they don’t have any overlap at all, so if you’re slightly out with your positioning a gap will be visible between the colours. It’s also made more difficult by the fact that the backing paper is not transparent, so you can’t easily mark where to position them before applying.
Cutting the decals into smaller sections makes life much easier--and safer, since if you are slight out it’s only one piece that’s effected. I laid the black outline first as one whole piece then added each colours section one by one. If I were to do it again, I would have cut his eyes out of the black sheet and put them on after the white face—this is the only area where I didn’t line up things well enough and separating the eyes would have minimised the flaw. But my mistakes are barely noticeable.
You can see another, perhaps clearer, photo at my DeviantArt page.