If you're sure your phone is now rooted (ie, you've successfully installed the "Superuser" App from the Market), everything from here on out can be done without the help of the computer. (Unless you need to transfer files to the SDCard of course.)
Once your phone is rooted, before doing ANYTHING else, I'd recommend doing a Nandroid backup. To do that:
1. Power down your phone.
2. Hold down the volume up, volume down, and power buttons all at the same time. (3 button powerup) to load into recovery.
3. Navigate to "apply sdcard:update.zip" and press the home softkey (Note: You'll always need to do this virtually everytime you boot into recovery.)
4. Navigate to "backup and restore" and press the power button.
5. Navigate to "Backup" and press the power button.
It should start backing up automatically.
Before you install DL30 or any other ROM I recommend you install Titanium Backup from the market. Run it, grant it superuser rights, and backup all your existing apps so you can restore them and the data associated with it later.
Now, once you've done all this. To install DL30:
1. Download the DL30 Leak from one of the following locations:
http://rom.galaxysense.com/kaos/DL30-leak.zip
http://rom2.galaxysense.com/kaos/DL30-leak.zip
http://rom3.galaxysense.com/kaos/DL30-leak.zip
MIRROR:
Multiupload.com - upload your files to multiple file hosting sites!
Alternatively you can download adrynalyne's Super Clean which removes a lot of bloatware from:
DL30_super_clean_08.zip
2. Put the ROM you just downloaded into a folder on your SD Card (I called mine "Root").
3. Power down
4. 3 Button power up into recovery.
5. Navigate to "apply sdcard:update.zip" and press the home softkey.
6. Navigate to "wipe date/factory reset" and select it with the power button. (It might ask you to confirm. I honestly don't remember.)
Note: You may want to preform this step twice just to be sure it wiped everything.
Note2: This does NOT erase your SD card.
7. Navigate to "wipe cache paritition" and select it.
8. Navigate to advanced and select it
9. Navigate to "wipe dalvik cache" and select it.
10. Press the "Search" softkey to return to the main menu.
11. Move to "choose zip from sdcard" and press the power button to select it.
12. Navigate to the "Root" folder (or whatever you named the folder) and select it.
13. Navigate to the "DL30-Leak.zip" file and select it. (OR the super clean zip file if that's what you chose)
14. Navigate down to "Yes – Install blah blah blah file here" and select it. (Wait for the package to complete.)
Note: This file has a kernel inside it, anytime you replace the kernel of the phone the screen goes all crazy for a few second. Just let it's do it's thing.)
15. Press the "Search" softkey to get back to the main menu, and select "reboot system now".
Note: Booting after this might take a couple of minutes. After the Samsung logo disappears you'll find that your screen is black but the softkeys will light up if you touch them. This is normal. It could take 5-10 minutes for the phone to boot for the first time. If however, you feel the phone vibrate periodically every 10-30 seconds that might be a sign that the install didn't go according to plan. In which case you may need to try the DL30 installation again.
Disclaimer: As with everything, I am not responsible for what you do to your phone. I'm just trying to help you achieve what you're looking to do.
