The long way is Yoga mediation
The “easy” way is shock.
Basically once to KNOW on a very deep level that you are not your body you can go anywhere in non-corporeal form.
I was caught in a rock slide in the Rockies and sustained a compound fracture in my arm and had some skin abraded from my back. Next thing I knew I was watching my rescuers picking their way carefully towards me from about 50 feet above my trapped body.
I was at a religious seminar in LA enjoying an ice coffee with some Buddhists and Scientologists when one of them said “Be 10 feet behind your head!” in a loud commanding voice and I was.
Peter Lamborn Wilson (AKA Hakim Bey) invited everyone listening to him on the radio (WBAI) to attend an astral party in Antarctica while they slept. I’m pretty sure I was there.
When I do astral project most things I see are vague along the edges of my vision. I seem to be only able to really focus on one thing that’s directly in front of me.
Maybe the yoga route would provide better clarity?