Subbing is very easy. Just nuke it for 10 seconds, stuff it in your crotch and usually the temp is good for atleast 2 or 3 hours. The heat pads are good for emergencies in case the temp dropped to low. If you're subbing with someone elses urine you'll need a digital thermometer. If you pickup one of the synthetic urine kitsit will come with a temp strip on the bottle.

Dillution really works best for light smokers. If you drink 40 ounces of gatorade the morning of the UA it will help dillute enough for a light smoker to pass but not get a negative dillute.