Hi,
Every morning I perform shoulderstand. A lot of books recommend that you should use halasana first, mainly because the flow of blood from your legs to your head can be a bit much. I find shoulderstand very comfortable but I find halasana a killer. I know a lot of people are very relaxed in Halasana. I have tried taking my legs over a chair, and even higher up on to a wall. I find halasana hits me in between the shoulder blades, like being stabbed with a knife. It is something to do with the head being tucked in and the arms working back. The moment my legs come past upright towards the floor/chair/wall, I no longer find it comfortable.
I can happily do a forward bend whilst extending my hands back over my head.
Anybody got any ideas?