Resetting ECU? And where to use Dielectric Grease?

Opinions will vary.

I disco' the battery cables and hit the brakes for several seconds. Others turn on headlights, touch the disconnected-battery cables together, etc to discharge the capacitors in the KAM.

For most things, I use dielectric grease sparingly. In Portland, you might use it more liberally. It's a means to keep connections from corroding together, water and dirt out, etc. But it does hinder conduction a bit, so dont go crazy. A little goes a long ways.

Good luck.