When you are a 'retiree' as I am it is easier to practice self-love than when one is working and trying, perhaps, to support a family. The pressures are far more 'pressing' and the free time needed to enjoy yourself is harder to come by.
But I think allowing yourself to do the things you love doing is a form of loving yourself. I'm sitting here at my computer answering this question. I have answered hundreds of questions on Hubpages. I love doing it, so it is a form of self-love.
But it goes further than that. I pick out and try to answer questions so that my readers of these answers gain something from them: some knowledge, perhaps triggering some insight...helping them in some way.
Not always, of course. Sometimes I just do it to act 'smart,' and come from my ego. But we all do this on occassion, I expect.
I love myself by going to the gym two or three times a week to keep my body strong and flexible. I eat nearly all the foods I like but I don't gorge myself into obesity. I like a glass of wine and a beer but rarely get drunk. I go to the movies and pick out movies that I really want to see. And I read books I really want to read.
I involve myself in group activities and subscribe to them, but do not take on rolls that I don't want to do. I'm courageous enough to say "no."
Oh, and when I think of it, I practice an exercise described by the famous American writer, Louise L Hay. I look into the mirror and say, " I love you."
Try it. It's not being narcissistic.