I received a review copy from OP and told him I'd leave an honest review asap.
I've finally gotten a chance to sit down and go through it. It's a good read (100 pages, lots of images), but I was pleasantly surprised by the simplicity of this method. I haven't seen it discussed elsewhere, and it seems very easy and straightforward to pull off. I haven't tested yet, but do plan on either testing it myself in the next week or two, as it's not difficult or complicated at all... but in theory, I see no reason why it wouldn't work if you put in just a little bit of time and effort.
The guide also has quite a few resources that make the method as easy to do as possible - I can tell the author has spent quite a bit of time with trial, error, and improvements, so this guide should save you a lot of time and experimenting.
I Have been into the Instagram game a while go with clients, but don't do marketing on there - but now I'm going to give it a shot.