The SkyMapPro file 20070120W shows the SW sky at 8:20pm on 20/1.
Comet McNaught will be 26 degrees to the left of Venus on 20/1.
The file C2006 P1 gives the local altitude & azimuth at 8:15pm for Comet McNaught C2006 P1.
The magnitude will be brighter than what this file says. Refr Guide8.
The following gives a map:
http://www.aerith.net/comet/catalog/2006P1/2006P1.html