Never used the two sets method.
Nor have I used very often the play over game without looking
at the notes, then play through it again system.
(I have tried it, some players swear by this.)
I play though the game, if I bump into a note and it has some key phrases in it.
'Checkmate', 'trap', or a !! or a !!! move etc...etc then I dive in.
And I mean dive in. I have spent hours on a note in the past.
Sometimes I never even got around to finishing off the whole game.
(no wonder I suck at engames. I've never seen one! I stop at the first trick!)
If the note at the start of the game is telling you what was played
in such and such in the year dot and does not come to any conclussion
or offer any advice and is there just to pad out the piece.
(The author is telling you he has a database and knows how to use it.)
I ignore those. Infact if I see a useless note I usually put a big red
cross right through it. I totally vandalise my chess books.
Use previous diagram to reset the position and take it from there,
or set up the bits again and play out the game till you reach the
position you just looked at. If it's an early middle game I always did this.
You have the Bronstein Book. Game 105. Bronstein - Gligoric
Note after 13....Rfc8. (or 13...KR-B1 is what my one says.)
Scan note, the words; '......can sacrifice his Queen' should pop out at you.
These are phrases you are looking for.
Dive in here and look, see if you agree or disagree, Really give it a good
going over. Play out some lines, try things.....get ideas!
You are being told it's OK to sac a Queen for two minor pieces!
This book was co-written with Vainstein (Bronstein admits Vainstein did
most of it) but the later note after move 34 in that game is pure Bronstein.
That is experience talking.
Snyder is a convicted beast. You probably did not know this.
I'm not into burning books - defacing them yes, burning them no.
Apparently his books are OK (I've no idea, I don't have one).
Before his conviction one often saw them mentioned as being good.
It's up to you.