simply put, wrapping your doll in an electric blanket on a low or medium setting for about 10-15 minutes (longer and higher as you feel comfortable).
Not to hot of course or you will turn you prized possession and companion into a puddle. Although I don't believe typical electric blankets can get hot enough to melt TPE, it's better to be cautious of hot spots.
But it makes for a much more exhilarating experience versus feeling like you're wrapping your legs around a butter-ball turkey you just pulled out of the freezer.