It was a bitch to remove and it left an impression left behind it. I used this rubber sticker remover wheel that you can put on a drill. And even that took a while. Then I had to sand it down to even it out. I wouldn't do it again if I had to do it again
Sand through them. No real good way otherwise that I'm aware of. I've heard of people using an exacto knife to cut the clearcoat around them and pull them off, but you still have to take most of the paint off anyway to prep the tank. I'm no expert though.