Well, most postures can be broken down into modified versions, so that you can work on the key actions or movements from a more accessible shape.
Notice how all four of these postures are very similar shapes?!
If you’re working towards Natarajasana (Dancer’s Pose) or Ardha Chandra Chapasana (Half Moon Bow/Sugarcane pose) - the first two postures above - try spending a little more time in the last two variations where you have more of a solid foundation on the ground. This way you can focus on engaging your core and increasing shoulder mobility, and gently opening up tight quads or hip flexors. Once you’re feeling a bit more steady here, you can start building on it by adding in the standing variations, focusing on grounding through the standing leg first and foremost before reaching for your foot!
Tip: a strap/belt looped around your foot is a great way to begin here, especially if you can’t quite reach your foot, or even if you can!