Decided to take the (small) risk and go ahead and buy the guide. I'll try it out and test it, and I'lll report back as soon as I can. I hope this doesn't get saturated easily, because that would be quite a shame if the method doesn't work by the time it's delivered to me!
The exact method does seem likely to be saturated if the initial vouch reviewer's statement is still true; that only about 20 of them exchange hands per day.
Let us know what happens though.
The method isn't extremely saturated, but I see fewer people buying the final product and a couple of listings already out there (40+). You're also going to need some metal if you want to do this method from scratch and have a decent understanding of tf2 and crafting/trading and all that jazz. For 10$, I don't think it's too bad of a method, but I definitely think that this could get saturated eventually. Feel free to pm me with any more questions!