Easy to find -- it's just next to the track (around SK288693), with a fence round it and an explanatory sign. From the south, there's a decent path up the side of Bunker's Hill Wood, and the track is well defined. The fence is presumably to exclude sheep -- there's a stile at the south corner.
It's a lovely area to stomp around in: the collection of stones about 100m to the south-east is fascinating, and there's a very nice marker stone (marking three ways -- Chesterfield, Sheffield and Bakewell -- presumably medieval) a few 100m to the east.
Hob Hurst's House is clearly defined, but not very exciting -- it's hard to see how it justifies its "Tourist attraction" symbol on the map. More might become clear in winter, but I expect the ground will get pretty soggy. (At the moment, the heather has had a fairly recent haircut.) You get some nice views, though.