How it goes:
Take every moment you pass a mirror, the window, water, etc. -where you can see your reflection- take a moment to look yourself deep into your eyes and say: “I love you!”
Try to speak it out loud rather than saying it silently internally- if you can´t because people are around, etc that´s OK.
That´s it! Do it as often as you have the opportunity and really dedicate yourself to it.