You should bump up your humidity to 60-70% during a shed and the temps can stay the same. I don't think you're supposed to do any soaking until the snake has shed and it's been a bad shed. I've read that soaking before a shed can actually cause more damage than good. Don't hold ur snake until it's done shedding because it can stress it out.
Read the stickies on the shedding process and the bad shed one in case you do need to soak after the shed.