Love someone, or something. Love him/her/it/they with all your passion. Fake it if you have to at first.
Love uncritically. Love intensely. Love all the time. Hear sappy songs on the radio as songs about your Beloved. Eat that ice cream and taste the Beloved's sweetness; feel that fall breeze as the Beloved's caress.
Translate pain into longing. You have to wait in a long line at the airport and you just so want to get on the plane. So make this: you so, so, so want him/her/it/they/whatever.
Say the Beloved's name. All the time.
You are allowed to love others besides the Beloved. But--see them as aspects of the Beloved. In their perfection see the pure and total perfection of the Beloved. Love intensely, love all the time.
When you dream the Beloved you are doing it right. When you hit your thumb with the hammer as you're driving a nail and your first thought is love, you are really doing it right.
Feel your love in your heart chakra. This is where the Beloved lives. Vibrate the Beloved's name there. Hit yourself lightly on the breastbone as you do this. See the Beloved in rainbows in puddles at the gas station.
Do this until your life has changed, until your world orbits the Beloved's star. Until nothing that mattered to you matters anymore except the Beloved. Do this until you can look in any mirror and see a being beauteous: the Beloved's Beloved.