I am by no means an expert, I just enjoy working on my own cars. Following this guide is done entirely at the reader's own risk.
Symptoms for the failure of this bush are described here.

Item number 2 is the bush, rather misleading shown above the subframe as it actually assembles into the bottom of the subframe housing. It is about the size of a Coke can. Its anatomy, very simply, is an outer steel cylinder and an inner steel pillar, which is bonded to the outer by means of solid rubber. This rubber connection is what isolates the vibrations of the road/subframe assembly from the vehicle. The outer cylinder is also coated in the same rubber.