how to go to Changsha West Bus Station from Civil Aviation Hotel by bus?

You can walk along the Wuyi Avenue in front of your hotel to find the bus station "Changdao Lukou Station" where you can find the bus line 312 and then take this line to reach Qiche Xizhan Station and then walk to the west bus station.
For finding the place of Changdao Lukou Station, you can ask the hotel staff in the Civil Aviation Hotel for reference.