Byerly System boots: Heat molding?

So I got the new Byerly System boot/bindings for Christmas and they have the heat moldable inner lining. There was no info in the box about how to go about the heat molding process, and these are the first boots I've owned that have a moldable liner so I want to get it right the first time around. What's the process? Do I just need to put them in tub with hot water for awhile and slip my feet in for so long? Any help would be greatly appreciated.