I used to be very diligent, and I believe that is quite valuable. I did full home bookkeeping in a software program. However, I fell ill a few years ago and fell out of the habit, too. I'm trying to get caught up and plan to do it again. A great book on the value of tracking our money is "Your Money or Your Life," by Joe Dominguez.
Well I am very diligent. I know paper and pen can get messy so I use Boachsoft Finance 2012. It is very easy. I manage my accounts almost on a daily basis. I also have a cash account aside my bank accounts. Are you using software. You could download one http://personal-finance-software.boachsoft.com