Haha, I just did it yesterday. Do you know Baisha Road? There is an agricultural bank at the intersection, and there is a road next to it called Yan Ziling, which also says "Yunan Street Tax Branch". Go straight ahead and don't turn to the physical examination department of Tianxin District CDC. Yes, there is a detailed process, which is very simple. Or you can look up "58 Yan Ziling Street" on Google Maps.
Their working hours are from 8 am to 12 am, from 2: 30 pm to 5: 30 pm, and there is no physical examination on Friday afternoon. It's simple. It only takes ten minutes. Their telephone number is 85 1238 12.