Firstly, you will need to go to OggSync Mobile Install and download the 2 files there. Most likely you would not need the .NET CF 2.0 SP2 file if you're running WM6 on the BlackJack. Using IE to download, it will automatically ask you whether you wish to install when the download completes, otherwise you will have to call up the File Explorer and go to /My Documents.
Once installed, OggSync will show up as a new application in the Start menu. When started, you will need to enter the GMail authentication details and complete the initial settings, such as picking the default Google Calendar to sync with and the timezone. After that, you can also set how far in the past and the future you want to sync with 6 months and 5 years given as the maximum respectively.
With the freeware version, OggSync allows you to sync to only one calendar manually. The Pro version allows multiple calendar syncing and you can set a time interval for it to sync automatically.