Monna,
Also, you need to make sure that you have some sort of accurate control for your heat tape. A rheostat is what many people use, but I don't trust them. I use an actual thermostat that I got from Big Apple Herp. It's twice the cost of the rheostat, but since you can use it for multiple sections of heat tape, the cost is more than acceptable overall.
To attach heat tape, you need to simple apply a non-conductive adhesive to the surface you want to use it on. Big Apple sells foil tape that works very well.
Have fun -- Darin