DIY Fly Fishing in Patagonia (argentina / chile)?

Does anyone have any idea where I might find information about do-it-
yourself fly fishing in Argentina / Chile / Patagonia?

I'm trying to book a last minute fly fishing adventure for over the
Xmas break. I have money, but not a ton of it, and I don't really
like going out with guides anyway, and have zero need for fancy
lodges, so I'd love to do it myself... but so far I've had trouble
finding any info, books or articles or anything, about actually doing
it yourself.

And even if I did go the lodge route, there's a bewildering array to
choose from.

Anyone have any advice?!

Thanks ahead of time for your thoughts!

Best, Tim