I use a Bosch Heat gun 1942: http://www.boschtools.com/products/tools/pages/boschproductdetail.aspx?pid=1942
And four heavy duty Spudger:
http://www.ifixit.com/Tools/Heavy-duty-Spudger/IF145-013
You just take your time and do not leave the heat on one spot too long. But follow the guide posted on iFixit.com and it will come right off. It will take a good 10 or so minutes to remove the glass. So do not rush it. You can crack the glass if you hold the gun in one spot too long or pry the side too fast before the glue is loosened.