Begin with using a double-folded blanket to be placed right above sacrum (see photo), setting it approx. distance 6-8" from wall (adjust in pose). Sit down on the blanket with one hip pressed right up against the wall. As you lower down, swing your legs up the wall. Once in the pose, you can adjust distance to wall, angle of legs to all, blanket and placement of legs all for comfort. Hips and tailbone will be in space between wall and blanket. Arms rest by your side, palms face up or variation with Goddess arms (photo above).
Variations: To ground legs, blanket or sandbag to hang from soles of the feet. Strap can be placed around calves, so you lose the feeling of holding up legs. Tight hamstrings or really uncomfortable with legs directly up the wall? Try a bolster angled into the wall to rest legs on, add blankets for more support or move hips further from wall. Another variation is Legs up on a Chair or on a bolster with blankets on top to bring knees into a 90 degree angle.