cabinet/woodworking experts

[kpc01]

I have some cabinet doors my wife wants me to put glass panels in. Any tips on how to get the doors apart? I've read heat, alcohol, and a few other things but looking for first hand experience. the other option is to router out the back of the door but I'm not sure I'm confident enough to do that. I have all the tools to do it but a little scared of ruining the doors.

thanks for any tips