I agree with you Josef, it's very hard not to fall into the trap of moving song from song. Everytime I hear a song I want to play it. But conversely, at least for an amature like me, playing the same thing over and over again is boring. So my compromise is I have about 4 "core" songs I practice week in-out, and 1 day/week I devote to something new, 1 day/week I stick to guitar tricks training.