Grab an OS map – are you sitting comfortably?
From S’bridge – cut through the estate and across the golf course (Stourbridge golf club, footpath so ‘get off and push’) cross Greyhound lane at the end straight onto Ounty John lane. This turns into a dirt road giving you a number of options. Best bet is to turn obvious next right, then left at the top (just past the fenced-off thingimajig), through gateway. Check your map, keep heading vaguely in this direction, you will come into Hagley (hint: cross the railway line), then make your way upto Holy Cross thru lanes, then upto the hills.
Alternatively, head out of Wollaston to the dead-end (by the big island near the crematorium). Get on the sandy track and just follow it pretty much all the way to Hagley. (Cross Sugar Loaf Lane, past Norton Covert, cross Norton Road onto County lane). Keep following obvious path (bridleway) always heading in the same general direction. You’ll eventually emerge at Stakenbridge just outside Hagley. As above, head via lanes to Holy Cross, then Hills.
HTH.