Just a note, it seems a lot of people recommend foil tape to attach the thermostat's probe to the heat pad. But on herpstat's website, they specifically state NOT to use foil tape, because it potentially messes with the readings of the probe. So I'm actually just using regular masking tape for that, and it's fine.
You don't have to worry about things setting on fire, because the thermostat will regulate the heat to only 92 degrees (or whatever you have it set at). Just for comparison, when our hands are warm, they're almost 100 LOL. And if the heat pad actually gets hot enough to burn paper, then it'll end up burning itself anyway, even without tape.