I also believe their will be a wave of individual guerrilla warfare attacks upon federal establishments and some localized sympathizers.
Most will be futile meager potshots ill timed and lacking in focus brought about by reckless poor planning and execution, basically your average American with little or no training will be doing acts of rebellion against a runaway totalitarianism government out of fear.
I do not see any large scale organized resistance groups or any centralized leadership, if anything people will just not accept any leadership as they have no more faith, and nobody has arisen worthy of leadership to defend the constitution.
Some states will have a more determined and organized plan of federal defiance while others will openly hunt down registered gun owners on any rules infringement no matter the smallness of degree. We are already seeing that in the NE where they can say even a textbook is a terrorists weapon.
We're all out of alternatives.