For the record, WkiiHow gives the most generic and stupid guides known to yours truly. Don’t go there to learn things. Seriously. Though, “The Art of Manliness” has told me this: In a nutshell, assertiveness is an interpersonal skill in which you demonstrate healthy confidence and are able to stand up for yourself and your rights, while respecting the rights of others.
Men’s counselor and author Wayne Levine calls boundaries N.U.Ts, or Non-negotiable, Unalterable Terms. Your N.U.Ts are the things you’re committed to: your family, your health, your faith, your hobbies, your psychological well-being, etc. According to Levine, “N.U.T.s are the boundaries that define you as man, those things which, if repeatedly compromised, will gradually—but assuredly—turn you into a pissed-off, resentful man.”
This is what I was looking for! Eureka! Now, pardon me while I grow a pair. 7 months ago