Hey!
It's funny because I started playing more or less the same time as you, have the same will to play cash, and I'm also playing 0,25 SnG's. However I'm not learning jazz guitar and vocals... But I'm a newly graduated pianist (classical education).
Now to the question of the thread:
What I did was to make a schedule where I discriminate not only the time I will be studying but also the format that I will be studying (books, videos, articles...)
I review my sessions usually the day after because it's more unlikely to be over-influenced by the session itself.
Studied the SnG Strategy book by Collin Moshman, a coach in this site, unfortunately I'm playing only 6-max due to restrictions in Pokerstars.pt (closed player pool and less variety of games) and that is not represented in the book.
I am looking to find some nice articles and videos. I will start from the ones in this site, some live play and theory explaining in YT (until I sign up to some training site, probably this one) since there is some interesting free content there.
Once I get a new pc, since the one I have now is too shitty to run skype or so, I will try to join a study group and add that to my studying strategy.
I don't have PT or HM, because of the pc manly, but I try to mark my hands somehow and post in forums to get different opinions from other people.
Unfortunately I have only applied this very recently so I don't have any results yet but I'm sure that organization can only do good.
Good Luck!