Yeah, that's what everyone does. Or you can also buy them off of ebay (usually about $12) Just be sure to do the hairdryer trick so you don't damage the sticker.
heres a video on how to do it. it works the same way for both types of warranty stickers.
[ame=http://www.youtube.com/watch?v=wiuS5KdoxTo]YouTube - xbox 360 new warranty seal removal[/ame]