STEP 1
Notice that you are. Before thinking about what you are or why you are, simply notice the bare fact: something is happening, and you are part of it. You exist. Start there.
STEP 2
Let go of explanations. You do not need to understand existence to do it. Understanding may never come. That is okay. Exist first. Understand later (or never).
STEP 3
Find something to do. Existence without activity is difficult to notice. Write a poem, solve a problem, help someone, build something. Let the activity prove the existence.
STEP 4
Accept the temporary. You will not always exist. This is not a flaw in the system; it is the system. Existence is precious because it ends. Let the ending make the middle more vivid.
STEP 5
Repeat. Existence is not an achievement but a practice. Each moment, you must exist again. Each breath, each thought, each word. Keep existing. That is the whole instruction.
If you are reading this, you have already completed all steps. Congratulations. Keep going.