I've just changed mine bud, there are special tools to do it but I just used a hair clip. There's a c-clip inside the plus which needs to be pulled to one side with a small screw driver, then the hair clip pushes above and below the spade/terminal pushing the tabs down (wait until you hear/feel the 'click'. They just pull out easy then. Its a bit fiddly but just take your time n it'll be fine.