Yes, yes, "live and let live." Doing the best you can with what you've got.
Recognition, and acceptance, of one's own shortcomings, be open to change, humble acknowledgment of one's own faults, with intent to improve oneself. It really is a solitary pursuit, though it CAN be accomplished simultaneously in a relationship IF both parties are interested and willing.
Lead by example could have positive results if the other is receptive to it. I'm being met with "you're not allowing me to have my emotions. You're telling me my emotions aren't valid. You're not being supportive/ caring/ open enough." And so on. There's not a lot to work with there, so long as the focus is on what the OTHER is doing wrong. Like a cat avoiding its reflection in the mirror...
See, I learn through that example as well. Taking responsibility for oneself, and if another can benefit or learn from another, that's their choice to take up, or not. Ignorance is NOT bliss.