Best to do it after work so you get a feel for the journey as well as the place.
Here is the ferry schedule from Aberdeen: http://www.td.gov.hk/en/transport_in...index.html#o09
Once you get off the ferry in Yung Shue Wan, head down the path past the toilets and you will see a an estate agents on the left hand side of the path :
http://www.lammaresort.com/contact_e.html
Go in there and see what they have suitable for your budget...