If you have an umbp with a non removable battery then it is the June 2009 version unless its a 17 inch but the process will still be the same. If its the one with the removable batter then its the late 2008 version.
Search for OTC video guides on youtube. Type in macbook HD replacement in search field, find the one for OTC, and follow the 10 minute step by step directions, very easy.