I'm still a beginner too but what I have been doing is trying to identify common situations where I am not sure what to do, and it seems like I'm getting run over every time those situations occur. Lately I've been studying the nuances of tournament play heads-up with various stack sizes, it turns out that I've been making a number of mistakes (playing too tight and folding the button way too often) and I'm working on improving in that area. I think it's good to focus on one aspect of the game at a time rather than trying to make some kind of big leap in skill. Trying to guess a player's range of hole cards based on their betting patterns is a good exercise, even if you're not involved in a hand.