If you are thinking of joining the resistance, you should already consider your data compromised. Your cell phone has been spying on you for the authorities since the day you bought it. But you do not need it for any of your resistance activities it should be at home. Instead, try making mental maps of the places you need to go. Do dry runs of the route you would need to take to best avoid the authorities. You of course have no hope of ever fighting the Yankee.
Know also that Spanish is widely spoken everywhere and there are no lack of people who can translate, no amount of encryption can remain unbroken. You still have to do propaganda of the deed, but you let the newspapers talk for you, you do not have to say anything, and never take credit. Talking can only be used against you so it should be kept to a minimum.
For your activities they should be restricted to outside of the 400 largest metropolitan areas of the U.S. You have no hope of operating inside an area even as large as Walla Walla, only on the outskirts where there are few witnesses and fewer police.
Whatever activity is chosen should be done at some sort of systematic approach. Under no circumstances should a written record be kept, it is unnecessary and potentially hazardous. If for example you choose to weld things together, a mental note should be enough of where groups of things are. A row of fire hydrants, a row of gated communities, a group of pumping stations.