Try this now. If you can't do it, you can do Headstand instead. If you don't want to do that, go home!
With the Ethical Rules and a little concentration, anything is possible.
Yogis love to be alone.
Don't teach too many postures; just the main ones, and hold them for a long time.
I am only here to share my knowledge with others and to help them make rapid progress on the path of yoga.
Always remember that Nature refuses to be rushed. She can only be made to evolve and that takes time, so take heart.