I would recommend a heat gun...which you probably don't have, so grab your wife's/girlfriends hair dryer. Get it warm, moving it around(the heat gun), and not concentrating on one spot. Grab something non-abrasive that will be able to catch the lip of your emblem, but hard enough so that when you apply pressure your tool(whatever you use, maybe a popsicle stick) won't break. Now that you have one side of the emblem coming up, take your time, as you don't want to bend your emblems.....re-apply some heat to make sure it's warm enough to melt the adhesive,....then again, apply pressure and slowly remove your emblem.
Use maybe lighter fluid, or something that will not damage your paint, like maybe a sap or tar remover(I have products here but, I don't think they are available to the public). Wipe away any leftover adhesive,.....bam your done.
If I were you, before you start, take maskeing tape, and make a border around your emblem,....taht way you won't have to measure and or quess were your emblem goes.
Hope this makes sense.
Jamie