I find Wild Thing to be one of those backbends where I can securely and comfortably open my heart. There's a wonderful balance between effort and ease here. Once you put in that effort of maneuvering properly into it, holding and expanding your chest while in it becomes effortless. This is also a good prep pose for entering Wheel pose.
THE ESSENTIAL DOs & DON'Ts
Don't slouch. Don't slouch your shoulders or your hips.
Do firmly press into the ground (fingers facing top of mat) and internally rotate that grounded arm.
Do keep your hips lifting and internally rotating (hips trying to spin up towards the sky),while pressing actively through your straight leg (flattening the grounded foot), and be high on the ball of the foot of the kickstanding leg.
Do push against the ground with both feet and rooted arm.
Don't rotate chest down.
Do allow yourself to open up. Sometimes it's scary to "expose" yourself. Backbends are a very vulnerable feeling position. So first give yourself permission and reassurance in doing so. Bring your shoulder blades together so you can arch into your backbend.
Do reach over your head (reaching arm coming by or past ear) and beyond. If you want to go deeper, then reach towards the floor behind you.
Don't strain your neck.
Do let your head fall and relax. However, it is okay to turn gaze towards hand if that is more comfortable for your neck.
Do take slow deep breaths before exiting. 3-5 for beginners. 5-8 for intermediate to advanced. Or heck... rotate into full Wheel pose!
P.S. Don't forget to sometimes not stress alignment and just let yourself focus on how the asana makes you FEEL. And always do your best, not mine's or anyone else's.
Grow With Your Flow,