Reddit mentions of Fearless: One Woman, One Kayak, One Continent

I'd suggest reading "Fearless" about Freya Hoffmeister's record breaking circumnavigation of Australia by sea kayak. It may scare the crap out of you, but is also very realistic about the experience of long-distance solo endurance. You may find that it inspires you, or dissuades you - either way, trust your gut. One of the subtle skills of endurance sports is a very high tolerance for suffering - you can practice this, but at a certain point, you either have it or you don't.

As for bikes, a rigid mountain bike that can take fairly large tires (2.4-2.8") will be important. Tubeless would be very wise. Depending on how much offroad you want to do, I'd look up recommended builds for the "Baja Divide" which would have some similar terrain, and has been a popular bikepacking route for a few years so many people have built successful rigs. You'd want to get to know the bike well, and get good at fixing it.