If you have difficulty supporting yourself in this pose, position a metal folding chair outside your left leg, with the front edge of the chair seat facing you. (yogajournal.com)
Support the lifted leg by pressing the raised foot against a wall or hooking its front ankle over the top edge of a chair back. (yogajournal.com)
You can hold this pose longer by supporting the raised - leg foot on the top edge of a chair back (padded with a blanket). (yogajournal.com)