One month? Let's see... I cache the banned ones well away from my residence, "find" the bills of sale to people who can't be found, and throw as much money as I can afford at the organization whose lawyers have filed suit in Federal court challenging the law's constitutionality, probably the NRA, SAF or GOA.
I also begin overstocking on 12-ga., 9mm, .45 and .22 ammo for the guns that are still legal.
When they come to the house, I ask to see the warrant (if they're being polite). In any case, I grab my family and leave the house while I still can, go to my neighbor's and call my lawyer. If I am prevented from leaving... well, it's all going to come out in court, anyway.
I am definitely not going to get into a shootout... there's a lot more of "them" than there is of "me". My area is way too suburban.