Fantastic! I'll make sure to put a small metal rack at the bottom of the boil pot so the nylon bag doesn't burn
I do BIAB for all my brewing. Relative to burning the bag, I put the bag in the pot and secure it by putting a bungee strap through the loops on the outside of the pot. Then I heat the water to about three degrees higher than my my desired mash temperature. At that point, I turn the burner off, quickly stir in the crushed grain, put the kettle lid back on and cover the pot with some old insulated coveralls that no longer fit my fat body.
Let the grains mash for one hour with no heat applied. Then pull the bag, let the wort drain back into the pot, and begin the boil phase.
DO NOT TURN THE BURNER ON WHILE MASHING. YOU'LL PROBABLY END BURNING THE GRAIN BAG.
The May/June 2016 issue Brew Your Own has an article by Rex Slagel "BIAB BEST MASH PRACTICES"
that explains it better than I can.