For yogis out there having trouble going up to the headstand, try a muktha hasta sirsasana instead.
This posture is (seriously) easier to achieve than the headstand and helps you get the confidence to do the headstand! :)
tip :: try to focus on your palms pressing hard on the floor. Use your core muscles to lift your legs up :) do not focus on your head or thinking about balancing. just press your hands on the floor and squeeze your stomach and core muscles :)