Anyway, I love it. Now, this tutorial comes with a few words of caution - this pose is not for those with neck injuries, and it definitely is not something to force your body into. Please, please, do not kick your legs up into this pose (or into any inversion where the head and neck are bearing weight). I'm breaking down the stages of this pose not only to help you get into the "peak" pose, but because every step along the path to cheekstand is a pose worthy of time, effort, and dedication. So, please listen to your body, and stop at whichever step feels best for your body at the time. Remember that as much fun as the poses are, the true benefits of the practice include developing the self-awareness, patience, persistence, and dedication required to get into these tricky postures.
Before going for the pose, please make sure your body is warm and open. I recommend some sun salutations, and a few standing series including poses that involve the main movements involved in the cheekstand. Good poses to warm-up with include twists (such as parivrtta parsvakonasana), an arm balance (such as bakasana), and an inversion (any one will do, but maybe practice sirsasana to make sure you can float up with your legs, instead of kicking).
Okay, now that you're nice and loose, here are the stages to the pose:
Stage 1: Chair Pose
Stage 2: Twisted Chair
Stage 3: Side Crow
From your twisted chair pose, look down to the ground, and exhale to plant your palms with your fingers pointing forward. Spread your fingers and root down into your fingertips. Rest your left thigh on the upper right arm, and keep your left elbow close to your side.
Turn your gaze forward of your fingers (don't look at your feet!) and exhale as you bend both elbows. Inhale to engage your core and use your oblique muscles to lift your feet off the ground.
Stage 4: Fallen Angel
Exhale to softly lower your left cheek down to the earth. Pay attention to your neck! If it feels sore at all, come out of the pose. Otherwise, press your palms down and inhale your sitbones up towards the sky. When you're ready, inhale to lift your top leg (the right one) and point your toes up. Pivot the bottom foot towards the top thigh.
Stage 5: Fallen Mermaid (Cheekstand)
Once you feel ready to lift both legs, press down even more into the hands and inhale to slowly reach the bottom leg up to meet the top one. Your hips will un-twist a bit as you find your balance. Take deep breaths, and keep the core and legs engaged. Here's a tip... if you start to lift the bottom leg but then immediately fall back out of the pose, before you lift the bottom leg, start to reach your top leg forward to help you counterbalance. You can then keep the feet apart until you eventually bring them together.
To come out of the pose, exhale your legs down behind you for chatarunga dandasana, then inhale to cobra or upward facing dog, and exhale back into downward dog.
Here's a video demo of the whole thing:
(PS. My amazing mermaid leggings are made by Schatzibrown)