Which exercises have you started, out of curiosity?
Just began reading yesterday, as I said, so not much yet ^^ Still at the intro of Apophis. But regarding Aegishjalmur I've started with those visualizations that are to be done 9 nights in a row. I actually had started those when I first read Apophis and Aegeshjalmur's beginning some years ago, but didn't do more than like the first 2 or 3, and not in any focused fashion. That kind of visualization still isn't easy, but it worked much better so far now that I actually put some more effort into it.
And I at least printed out those pages which are about the rune meanings and poses and would like to study those next. Actually I'm a bit skeptical whether those rune poses are anything worthwhile as I've not done anything like that before (well, I do hatha yoga regularly, but in a pretty much completely unspiritual manner so far), so I'm curious to see whether that technique proves useful.
I already have a rough idea of the rune meanings since I once read a book by Jan Fries on that and actually incorporate some runes as symbols in my personal notes since quite a while already. But re-reading that chapter showed me how much I had forgotten due to never using it.
Those exercizes on the 5 senses, yeah I remember reading about them but I lacked the discipline at that time to actually practice that much.