I will try this at some point, but

visualize a parade of tiny soldiers marching in front of you.

Any advice for those of us with little-to-no mental imagery?

Once when I was sad I used a thing which I think I saw on LW, of typing out my thoughts as they occured. It sounds kind of similar to this; any relation? (It helped me to feel better, but I haven't had occasion to use it since; and it hadn't occured to me to do it when not-sad, but maybe I will now that it has occured to me.)