Here you go again. If you encounter problems post here and we will help.
NightlyBuilds - gaosp - Project Hosting on Google Code
To ease up the step before 1 in that guide i suggest you download the GalaxyUpdater via Market and use that to install your Recovery 6.5. If you are in a country that can buy apps from market, i suggest you buy the full app and install the whole GAOSP from there, and also support the developer.