1) download Dominator on your computer (make sure you download the one that corresponds to the recovery you use whether it be SPRecovery or Clockwork), it will be a zip file.
2) unzip it and you should have a folder with the same name as the zip (inside the folder are the files). The folder itself is a nandroid back-up so take that folder and put it in your nandroid backup folder (if you are using SPRecovery the nandroid back up folder is on the root of your card. If you are using clockwork it is inside of the clockwork folder on the card, i think the folder is just called backup)
3) reboot into recovery and wipe both the data and the cache. ( i dont know if it makes a difference but because it was a completely different rom from what i was using, I wiped both of them 2 just in cast, probably not necessary though).
4) once it is wiped then you need to go to "Backup/Restore"
5) select advanced "advanced nandroid restore"
6) now pick the file the file that you downloaded (dominator)
7) once you selected the file it is going to come up with 4 or 5 things to select to restore. You only need to restore the "boot" and the "system".
8) once that is done reboot your phone. After you sign into your phone set everything up like setcpu, widgets shortcuts, etc... Also there is an app that comes stock with the rom, it is called "autokiller". It essentially helps manage your memory more efficiently. Open that and then once you allow it to have root access, press the menu button and then should be a few option that you can select. Select "presets" and then select "aggressive" and then ok.
9)this part is probably optional but i usually do it so it starts fresh. Shut your phone off and then turn it back on.
one thing you will notice is that when you turn your phone on, the boot up time is half of what it was. thats one thing i liked about it
10) the last step, and this is extremely important and crucial. ENJOY THE PHONE haha