Keeping my diet on track on the weekends. I just don't eat enough good foods (or food in general) and when I do get calories, I rely too much on shakes.
During the week it's good because I'm at work and have a set schedule where it's close to the same day in and day out. On the weekends, I work at nights at a bar, and I sleep in late, so my eating schedule is all out of whack.
In terms of actual training, changing my routine. I seem to get one routine, and stick with it for too long, even when I'm not seeing gains. I am slowly learning to be more open minded in terms of routines, and when something stops working, change it up.