Nervousness in dogs generally looks like paranoia. Lots of head movement, checking whats going on behind the them, the inability to sit still, eyes darting back in form, very fast/frantic movement away from stimulus. Over-curiousity.
Check out the videos below to learn all about dog e-collar training. You'll not only learn about training your dog using an electronic collar; you'll also learn how training differs for dogs that are stable versus dogs that have behavior issues. Due to time constraints, there will only be videos and no short summary