One of my summer projects has been reading A Thousand Plateaus by Gilles Deleuze and Felix Guattari. This is definitely a book that invites (requires?) the use of secondary sources to figure out what the fuck is going on. And, in fact, part of the fun of this book is that it’s so new (first published in 1980; first English translation 1987) that there’s no authoritative “interpreter” of it out there, as we have with other French theorists like Baudrillard, Foucault, Lacan, etc. So, in other words, if you do figure out what the fuck this is all about, you could contribute to our understanding of that this thing is.
One of the best sources I’ve found so far for reading D & G is this lecture (YouTube) that Manuel DeLanda gave in 2006 on Deleuze and the History of Philosophy. DeLanda is a really lively, smart lecturer, and he makes it really easy to understand some of the main points about Deleuze’s philosophical project. So give him a try. It’ll take you a little over an hour, and it’s time well invested.