When I worked with caregivers we used to give examples of self-care, such as taking time out for yourself, relaxation, social time.
We also used to acknowledge that some people feel guilt when they do nice things for themselves which may stop them from doing so, and explore with them the reasons they may feel guilty and the outcomes of not practicing self-care as opposed to doing so. Not surprisingly care-givers who don't practice self-care are far more likely to suffer burnout than those who do, and reach a crisis point. I think that's the same for everyone not just care-givers. Self-care is very important for ourselves and those around us.
I think for me it's a case of being kind to myself, treating myself as I would a friend. Some personal examples:
1) Regular exercise
2) Eating nutritious meals
3) Relaxation - a soak in a bubble bath
4) Social time with friends who lift my spirits
5) Practicing mindfulness
Good luck with your self-care BA.