I've only seen it once, last month through tnott's 22" scope with H-beta filter and in pretty good dark skies (although not the absolute darkest). It was easy to see as an area of differing contrast, and while the general shape was there (or imagined?
) it was difficult to recognise any of the outline. The top edge of the horse's head was the closest thing I saw to an actual outline as we'd recognise from a photo.
Don't think I'll bother with my 4.5", LOL! Good luck anyway Liz, worth a try!
But there are lots of better things to look at - HH is really a photographic object and aside from the 'twitch' value of vaguely spotting it, it's a pretty poor cost/benefit ratio IMO!!
Cheers -