Article: OS X 10.8.5 Update
Pretty much went exactly as above, from a working 10.8.4 system, except:
4. didn't do this, just left it in there and re-installed with MultiBeast 5.5.2 before Restart
5. didn't do this either, no problems that I know of
7. Realtek ALC889 with DSDT, Trim Enabler...