Definitely grab up some Goo-gone or similar- make things really simple. If you're removing a badge, like the ones that say GTA or whatever else, use a piece of dental floss behind it, then get the leftover glue off with the goo-gone. In lieu of a hairdryer and a long extension cord (not everyone has outside outlets or access to a garage), park the car with the sun beating on the sticker you want to remove for 10 minutes or so. But remember that the paint/glue/emblem/sticker is gonna be
HOT and you'll likely get a couple of nasty blisters. Suck it up and be a man about it though