I used to be in the Cal scene on DoD : S.
It took up literally all my time, I remember practicing for literally 2 days... I am never going to play again. If I were to start playing again I would go on public servers, and most likely just be banned because they would think I am hacking. I wasted alot of time I could of been reading.
BTW, try this...
When you wake up, do not masturbate, and do not eat, take a very cold shower, meditate for about 1-2 hours.
Then bust out any book or do something that you had no concentration on, and you will see how easily you will get everything you could say.
I tried it about 2 days ago, and it was epic win.