Hi,
Your right not to soak before the shed but to keep it in mind if it goes badly.
I think most of the info you need is in the bad shed sticky.
But just in case;
Temp: Around 80-86f is fine.
Place: Variable but a tub with a nice secure lid would be a good idea - you don't want it to have too much ventilation either to keep the humidity up - but you do need some. And do not make the water deeper than half the depth of the snakes body and remember to supervise it to make sure nothing untoward happens.
Duration: I would think 30 minutes should do it.
dr del