It doesn't take an army to change the world, or an average-sized militia group, either. All it takes is one individual to say the word "No". Be it a man refusing to register for the draft, or be it a gun owner refusing to register his weapons in Connecticut, it is the same: defiance in the face of arbitrary authority.
However, unless that individual wants to live the life of "Bartleby, the Scrivener", follow-up action is required.
Gene Sharp has written extensively on techniques of non-violent resistance. Here's two samples:
List of specific techniques:
Specific methods and why they work:
Many of the techniques that Sharp describes require a large number of people to implement. Also, some of the methods are aimed only at "raising awareness" instead of achieving results. As such, instead of non-violent "propaganda of the deed", those specific methods are "propaganda of the wussie".
We can do better.
Here's a 32-page OSS manual from 1944 called "Simple Sabotage Field Manual." Chapter 5 (the last and longest chapter) is great, especially the part on organizational sabotage! All the techniques listed there can be carried-out by a single individual. Some of the ideas are out-of-date, but can be adapted to present day situations.
One of the most important parts of the OSS manual is the creation of a "feedback" loop, where "the citizen-saboteur acquires a sense of responsibility and begins to educate others in simple sabotage".
In 1983, the CIA airdropped copies of "The Freedom Fighter's Handbook" over Nicaragua. The techniques in this 15-page handbook, while being more modern, aren't nearly as creative as those found in the OSS manual. Also, the CIA manual doesn't include a "feedback" loop like the OSS manual does. The cartoons don't help either.
It is with techniques like these that "No" becomes "Hell, No"!