I use a warming try that I bought fromthe thrift store for $3
put it on low with a cloth and set the assembly on
lt will heat to about 70c
then use a toothbrush and apply 99% rubbing alcohol to soften the glue
now use a thin tool of choice to slide through the layers do not push and pull
as you slide out dip the tool into the alcohol and re enter
this will help keep it from sticking and will keep the glue from resetting
the whole process is done on the tray
use a thermometer to check that the cloth stays within 10 degees of 70c (170f)