It's not too far, but it's a bit troublesome to transfer. The most convenient way is to take 8 1 1, get off at the east gate, and then take 5 18/703/536/ 18 to Guanshankou to the gate.
As soon as you enter the gate, there is a school bus, so you can go directly to Huo Da.
As for block B, you can ask for directions, because several blocks are together.
It's easy to walk in.