http://asui.garage.maemo.org/download.html

Open that URL on your tablet's browser and click the three green links to install those repositories. Then open application manager and install community SSU enabler (or whatever looks similar to that), telescope, advanced systemui, openssh, openntpd and diablo5. Once the community enabler is installed you need to go to the update section in application manager where you will find the community ssu, upgrade it. Then change to the diablo5 theme from the home menu and reboot.

Diabloturbo will be the hardest to install but you can find installation steps at http://talk.maemo.org/showthread.php?t=69740 .

Most of those packages don't need to be configured or will be harder to configure unless you know what you're doing. ASUI provides a graphical config app that you should look at and the website (above URL) has more documentation. If you don't know what SSH is or how to use it then don't install the openssh app.