Equanimity, recognising all beings as your mother, remembering their kindness, wishing to repay their kindness, and the affectionate love which sees them as beautiful. Thus you begin to meditate on equalising yourself with others. How should you equalise yourself with others? First of all, you need to understand what you mean by "self", when you think in terms of yourself. When we think "myself and others", this "myself" has a sense of great importance, whereas "others" has a sense of much less importance.
However, consider it from the point of view of numbers: you are just one, whereas others are countless. So there is a discrepancy in the way you regard yourself and others: although there are so many more others than yourself, you regard yourself as more important than others. this is completely wrong. You need to think over and over again about the fact that there is not the slightest difference between yourself and others in terms of wanting to be happy and wanting to be free from suffering. In this regard, you and others are exactly the same. when you meditate on the kindness of sentient beings according to the seven-point cause-and-effect instruction, you recollect how kind they were when they were your mother, whereas when you meditate according to the instructions on exchanging oneself with others, you recollect their kindness not only when they were your mother but also at other times, when they were not your mother. This meditation is more extensive. Therefore, when you train your mind in the instructions of exchanging oneself with others, the strength of your affectionate love and great compassion will be greater than when training the mind in the seven-point technique of cause-and -effect.