It can't be too hard to do.
..and it's even less difficult to install it manually.
[copied from iPodtouchfans forums]
iPod Touch - Summer Board Install Guide
Ok, so here it is. I know a lot of people have been having trouble with SummerBoard and so I took the time to replicate the problem on my iPod Touch and worked through the entire process to get it up and running. Please pay close attention to the 10 steps below. You can do this!
1. You'll obviously need a jailbroken iPod Touch and installer.app.
2. Using installer on your iPod Touch, install Summer Board 2.11.
3. Restart your iPod Touch. When your device boots back up, do NOT worry if your dock is stuck at the top of the screen. Mine was too at this point!
4. Download this:
http://www.nullriver.com/~zigzag/SummerBoard.zip
5. Extract the files to a folder using WinZip, WinRar, or your other program of choice for extracting files.
6. Open up your newly extracted folder.
7. Using WinSCP, CyberDuck (for all you mac users), or your program of choice, SSH into your iPod Touch. You'll need WiFi for this. For those that don't know how to find your IP and such...here you go:
Settings > WiFi > Under your network name tap on the blue arrow > IP Address.
Type that into your connection box.
User: root
Password: alpine
8. This is where it gets a little bit tricky, so pay close attention! Once you've SSH'd into your device navigate to these folders one at a time, delete the file/folder below in parenthesis, and replace it with the file you have just downloaded:
/Library/Frameworks/ (SummerBoard.framework)
/Applications/ (SMBPrefs.app)
/var/root/Library/SummerBoard/ (Themes)
/System/Library/LaunchDaemons/ (com.apple.SpringBoard.plist)
9. Once you have successfully replaced these 4 files / folders set all permissions on the new files / folders to 0755. This will give you the ability to read, write, and execute on each file. In the case of a folder, make sure the permissions are set recursively (this means on every file in the subdirectory).
To set permissions using WinSCP, right click on the file or folder, go to properties. Then simply type in 0755 under octal. Hit ok and repeat for all the new files.
10. Restart your iPod Touch by holding down the top button until you get a slider to 'turn power off.' Do this and then hit the top button to boot up your iPod Touch. If you have done everything correctly then you will be looking at a fixed dock and you will be able to use SummerBoard!
Don't forget that you can also install more themes with SummerBoard from the installer application now. Enjoy!
[/copied from iPodtouchfans forums]
In my installer on my Touch I have something called summerboard 2.11. Does that me I already have it installed?
did you install it? if not, then you don't have it. to see what IS installed, look in the "Uninstall" list.