sony KP-51WS510 Calibration

I just fixed a sony KP-51WS510 convergence problem thanks to all the wonderful help from techlore!! I was lucky enough to get the tv for free because of the problem and am now loving the world of the big screen...  I thought I read something about get the calibration done to optimize the picture? What recommendations do have about calibration?  No need, use a dvd, manually or hire someone?