RE: when do u gut them?
It seems to be a regional thing is my observation. Many of my friends in the south do not gut in the field because they can usually drive close to the animal. Here in the NE most people gut em where they fall because we have to drag them out and sometimes that can be a long haul. If the deer has been shot in front of the diaphram (lungs/heart) and it's not too warm (35 or lower)I don't think there is any real urgency to gut them. If the hunt is going on for a few more hours I usually wait. If the conditions dictate that they should be gutted and cooled then I do it immediately.
HTH and good luck.