dont just pull them off, start at one end of the badge and gently cut the adhesive pad with the wire working your way to the other end of the badge, to replace them, buy some 3m double side sticky tape from the auto store and stick them back on
or, if you have a set of feeler gauges you could use one of the small blades of the gauge
When I removed mine I used some chewing gum remover from the DIY shop. Spraying it between the panel and the emblem softens the glue and makes them easier to remove. Leave it overnight and use plenty for the best result. You could use other solvents (petrol would work) but be careful as some solvents can damage the plastic.