As of yet I have not seen comet Panstarrs myself, but I shall be looking out for it in the next few days if we ever get any decent clear skies here in the UK.
So where do you look for it? Well you need to be looking to the Western horizon an hour or two after sunset. I have added some images below to help you.
Click on the images to enlarge them.
The first image is on 15th March 2013 @ 5.15pm
This second image is for 16th March 2013 @ 6.15pm