Here's a list of ten steps to make your money budget simple.
http://zenhabits.net/2007/05/10-ways-to-simplify-your-budget/

The tips I like the most is the 60% solution, where you split your income into 60% for basic bills, rent and groceries, 30% for various savings and 10% "fun money". The second tips worth trying is the envelope trick: Use cash for all expenses which can not be done over the Internet; it would pretty much boil down to groceries and "fun money". However, withdraw from the cash point only twice a month, and split this into an envelope for each category. When the envelope is empty, the budget for that post is used up.