I've put up dozens of wall stickers and I thought it might be an idea to do a 'how to' article listing the things I've found are a great help but aren't always in the instructions. The main over-riding thing to remember at every stage when you put them up is to take your time, it's easy to get carried away when the first bit goes up easily and this can lead to stretches and tears. And that's it! Once you've finished go over the whole thing with your clean dry cloth and squash down any bits you've missed. Your wall sticker will last at least five years outside and indefinitely inside!