I agree, bonding girls is very difficult to do successfully even if you are an experienced rabbit 'bonder'. You would do well to get a neutered boy.
Bonding can take as little as 3 days in my experience, but needs to be done on totally neutral territory. Keep the bunnies side by side at first and monitor their reactions. If all looks well introduce them but stand by with a towel to throw over them if anything kicks off.
If you do manage to bond two bunnies, then you need to keep them somewhere neutral until the bond is really strong Sometimes a week would be long enough. An introduction back in to an area where one of the rabbits has already been living before the bond is strong can cause it to break.
Also, make sure that you have 'de-smelled' the old area with something like Simple Solution so that it seems like it's neutral.
Good luck...