You can use the Heat Gun for sure. But, the difference with the hot plate is that if for example you put the temperature in 80 degrees (hot plate) the complete screen will get the same temperature. If you have one you can use 75-to 80 grades for about 8 minutes so the adhesive can be loose well. Always use the guitar picks and use them with care.
With the heat gun you need to put air in all the border of the glass with movement until you felt hot (hot that you can touch) so you can start to work all the way around.
I would recommend you have adhesive remover pads, alcohol, gloves and protective glasses :)