This is pretty much what I wrote from another post. IMO a blow dryer is by far the best way to go about it. Prolly wouldn't hurt to have a spatula, but I just used my fingers. Anyway, what I wrote to another person who asked this was:
The absolute BEST way to remove it is w/ a hair dryer. Put it on hot & start at the corner of a sticker. It'll kind of just come up as you'll see. If it's done right that'll be all ya need. Ya may want to get an adhesive remover in case there's little snippets of glue left over. Even then I'd wait until after ya used the hair dryer on it & see how many snippets there are. Odds are you won't need the adhesive remover. My guess is any little glue spots ya have can be pretty much rubbed off w/ your finger. Once ya do a sticker or two you'll get the hang of it.
It gets a lil hot, but nothing unbearable. Again, just heat the corner, let it bubble up a lil. Then slowly start peeling away keeping the dryer moving up the sticker.
When ya first start, ya will prolly get half a sticker off & it'll kind of snap off on ya. Not sure how Conways stickers are, but what I'm referring to here is ya might get the "Con" off & ya have to start over w/ the "way". Not a big deal though. You'll prolly see what I'm referring to when ya do it.
By time ya get to the 2nd side of your van, you'll be a pro & the whole sticker will come off in one smooth motion. =)
Good luck to ya,
Danny