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Apart from a H-Beta and lots of aperture, the most important requirement is a very dark sky and full night vision. As mentioned the H-Beta is very narrow and darkens the background significantly. It works best with an eyepiece that gives you a large exit pupil. I have observed it through most of my eyepieces to see how the view changes, and it stands out clearest in my 21 Ethos.
I put the 2 stars HD37903 and HD37805 at the top of the FOV (in my reflector), so look for them on a star chart. The distance between these 2 stars is the same as the distance between HD37805 and the Horsehead. That's what I use as a guide to spot it. Alnitak has to be out of the FOV because the glare will wash out the Horsehead.
The other thing is to be prepared for just how faint it is, it's just a darker shape against the background sky. You may find when you spot it, that you had been looking at it for a while without realising. Good luck.
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