Do you have charts that show where Pluto is when you observe? Otherwise you won't be able to distinguish it from all the other faint real stars around it (assuming you can even see it) and will have to check over several nights to see which one moved. It will certainly make you appreciate what Clyde Tombaugh had to go through to find Pluto.

You might find this page useful:

http://www.astronomical.org/astbook/adv4.htm

From Sky & Telescope:

Pluto (magnitude 14, in Serpens Cauda) is in the southeast before dawn.

While you are at it, you might as well look for 2003 UB313 - it's bigger than Pluto, so that should make things easier. :^) S&T mentions it in their Planet Roundup now:

2003 UB313 (magnitude 19, in Cetus) is getting low in the southwest after dark. This is the "tenth planet" discovered last year; see our articles on its discovery and on the finding of its moon. Advanced amateurs with good CCD setups have been imaging 2003 UB313 and tracking its motion. The discovery team is informally calling the object and its moon Xena and Gabrielle, for the TV warrior princess and her longtime companion. The official names they will get are still tied up in committees of the International Astronomical Union. According to the February 1st Nature, "Xena" is unquestionably larger than Pluto: 3,000 kilometers in diameter compared to Pluto's 2,300.

http://skyandtelescope.com/observing/ataglance/article_110_1.asp