Under the "toughest" would be:
NJ, because they limit CCW permit issue, there are no long range rifle ranges, you can only use FMJ ammunition, they have a maximum magazine capacity law in effect...
CA, For much the same reasons as NJ
NY, because you can not get a CCW permit issued....
Under the easiest would be AZ, UT, VT and possibly PA when you exclude Philadelphia... ( :? ) Arizona you dont even have to register your firearms and allows open carry, VT doesnt require a permit for concealed carry, UT allows concealed carry on its campuses, and PA allows open carry.
I personally hope NJ and CA fall off into the ocean. I have many friends from NJ but I have already informed them they are acceptable collateral damage in the case of losing an asinine section of the country. I can always make more friends, but as Ron White says, "You can't fix stupid"
....God I hate NJ....