Using a wall gives you the support you need to work on headstand without the fear of falling.
From the previous position with both legs straight and your feet on the floor, step both feet onto the wall, walking them up so your thighs are parallel with the floor. Keep your legs straight to increase flexibility in your hamstrings and lower back, and draw your navel toward your spine to work your abs. Holding here for five breaths will allow your upper body to feel what it's like to hold headstand. This pose might look easy, but you'll really feel your upper body burning after holding for a while, which is exactly what you want.