ouch.... you'll need to root your phone before you can remove the launcher. Follow the instructions on the sdx site. It's simple really. It's the same method you used to load the launcher.
[How To] - Root Android 2.1 DD03/DD10 - v7
info is in that thread. Use the .zip update method. After you root, follow my previous instructions to the T.
If you don't have the joeykrim recovery installed, you'll need to do that too. You probably do have it installed, it came bundled with DD03/DD10.
After your rooted and ready to go, download the android sdk.
Android SDK | Android Developers
for the sake of simplicity, put/install the sdk into a folder that looks like this.
c:\android-sdk-windows\
All my instructions will use that format, so it is important you do this.
Once your rooted and have the sdk installed, enable usb debugging on your phone, and connect via usb, in recovery mode.
Open a dos command prompt in windows. You can do this by going to:
run-->CMD
in the command prompt, type this to get adb running:
cd \
cd android-sdk-windows\tools
adb shell
After adb loads up, a "#" sign should appear indicating you have done it correctly. if a "$" shows up, your NOT rooted. (remember, you MUST be in recovery mode)
So at the "#" prompt, type this in line by line to get rid of the launcher.
su
cd /system/app/
rm Launcher2.apk
rm Launcher2.odex
reboot