Phase 1
Popular culture says sit with your hands on your knees, have your thumb and index finger touching. Do not do this. Also do not sit lotus-style. Both are ridiculous.
Sit criss-cross applesauce, Indian-style or cross-legged.
Have a pillow under your legs for them to rest on, see lady in picture.
Have 2 or 3 pillows under your behind. You're creating a slight tilt forward that is important.
Erect your spine like a string is pulling from the top of your head upwards but don’t over strain. Middle the setting.
Overlap your hands in your lap with thumbs slightly touching.
When your posture slowly goes old lady/man on you, trippy how you are not aware, gently correct.