Tried peeling a sticker off something and it's left that annoying sticky residue that's impossible to get off behind? Get some lighter fluid and dab it over the sticky part. It will help you remove it extremely easily.
For websites where you can only sign up with your address once, simply add an 'A' (or any letter) to the end of your street number (e.g. 123A Fake St). The site will now see a new address and the postman will just ignore the extra character.