There are videos on YouTube showing how to remove the badges using a heat gun and dental floss, you use the heat gun to make the adhesive more supple and then use the dental floss to cut through the adhesive using a sawing motion. There are two locating pins on the back in the middle so once you get to them, start working from the bottom of the badge. As for fitting the new badge. If it comes with an adhesive tape on the back then it's just a case of removing the protective layer and putting it in place but if not then you could use the same method as me and use a vhb tape (double sided foam tape) and cut it to fit the emblem.
