Wish me luck, I am going in!
Be aware that the reason many people miss spotting the Horsehead, even with ample aperture, dark enough skies and a decent H-Beta filter is that though they pick up the start of the faint line of IC 434's nebulosity at Zeta Orionis and are able to follow it out a bit, it seemingly fades out on them before they get to anything that seems even remotely plausible as the "Horsehead"...and fail to realize that this "fade-out" point is actually the start of the Horsehead's "shoulder" (!!!) Looking carefully a bit further down the line from where IC 434 apparently "vanished", try to pick up the point where it subtly resumes (that's the other shoulder-side to the "head"). Look carefully, and you may then see the faint outlines of the "neck" on either side extending at a sharp bend up from the "shoulder" (indeed the sight is more like the faint outline of a blackened-out thumbprint indentation). Having sighted this, if you have patience and a good, dark, transparent night, you may then pick up the outline of the horse's "snout" extending in one direction from the neck. It won't be anywhere remotely as vivid or close a resemblance to a "horsehead" as appears in astrophotos, but you'll have seen the real-deal available from a visual observing standpoint. Heck, once you recognize even the indentation of the neck unmistakenly, you'll have "seen" the Horsehead as well is available under good, but less than perfect conditions on a majority of nights.
BTW: if you have Kepple & Sanner's "Night Sky Observer's Guide" handy, there's an extremely helpful photograph of the visual landmarks for finding the horsehead, PARTICULARLY the asterism of two stars that form a near-right triangle with the horsehead's shoulder at the third vertex of the triangle.