It’s important to check first Khenpo Urgyen Tsering — Advice on Dzogchen Meditation.
Sit and look straight at the ཨ.
If the image starts vibrating or you get visual artifacts, look around and then, come back to the image.
You can go up and walk and come back to it.
This can be done any time of the day.
Why ཨ?
Perfection of wisdom paramita is included in Prajnaparamita, Prajnaparamita is included in Gate gate pāragate pārasaṃgate bodhi svāhā, and that is included in ཨ.
ཨ is emptiness.
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