Can i have some help with my straddle press to handstand?

well i have been trying to attempt a straddle press to handstand, and i have been using the wall to help me. well i actually have been using my garage door and i have been also using two bricks under my feet, except when i lean over i bang my head on the door and it seems to help me get up. it is bad to bang your head on the way up to get there or is it just included in the process to get the handstand?i mean i can do it easy by doing a headstand its just a little confusing and all.can you help not just with this question but what are some other ways to get this handstand, not just by using the wall and do i need to be able to do anything before i can even think about doing this?