I don't know that I agree that those poses are advanced. Crow pose (the last one you described) takes some core strength and some fearlessness, but there's no harm in trying it as a beginner. Headstand is very doable with some proper instruction (assuming the yogi is being spotted and/or is using a wall. Handstand's probably the hardest. I personally don't practice it because of my hands, but again, with proper instruction, it's doable.
For me, the irony with yoga is that the poses you're most likely to do from the start--down dog, up dog, mountain pose, to name just a few--are difficult to do correctly. Regardless, if you're honoring your body, it's possible to at least attempt most poses. You may not get very far into them, but that's okay.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher