I have no formal qualifications in Aikido
I used to teach Self-Defense before I became housebound. I included a lot of Psychology in my teaching (I have formally studied Psychology).
You need to see into the mind of the attacker and learn about "attack scenarios" also. You need to have a good knowledge of Human Behaviour as well, especially, how people react in confrontational situations - including yourself.
I'm not teaching any more.
taught my friends the basic rules, based on my own real life experience (for what it's worth).
I'd listen to the other other guys' advice before mine.