As mentioned in other threads since the revamp, it's much easier to use the 'B' end to change platforms via the old bridge. This is not very well signed at platform level. The 'A' end is divided into 3 zones to allow public access from the Bullring in between these zones through the station without having to go through barriers.
Also as mentioned in this thread, the easiest way to change onto the Kidderminster line is to get one of the 4 tph from New St to Smethwick Galton Bridge (weekday off-peak at xx01 local, xx08 Liverpool, xx25 ATW and xx39 local) and change on to one of the 4 tph direct to Kidderminster.
As you seem to like your ale, in Kidderminster don't miss the King & Castle, Weavers or the Beer Emporium, all near the station. In Birmingham, also near New St, the new Head of Steam in Temple St is getting rave reviews as well as the Wellington, of course.
Sheds.