http://planetelderscrolls.gamespy.com/View.php?view=Mods.Detail&id=2487

I want to use this mod because of the DB attacking too early in game. If I use this and I already have a character that has the DB questline in their journal will it screw something up? Do I need to start over to take advantage of this mod?

Help me please!!!

I think you should be okay. It just replaces the one "dbattackscript".

If you already have a journal entry under "Dark Brotherhood Attacks" then the matter is somewhat moot. You can prevent further attacks by speaking with Apelles Matius on the subject - no mod required. Adding the mod in question to your game at this time might prevent further attacks without speaking with Apelles Matius - I do not know what changes it makes to the attack script. Some so-called 'Dark Brotherhood delayers' also alter the equipment the assassins use. If this mod does so, then that might be another reason to add it after the fact.

If none of these solutions are acceptable to you, then you will need to load a saved game made before the attacks or start a new game and from that point forward run the mod to prevent the attacks.