I also put aside 20% of my daily jobs earning as saving. And then the what's left is I budget it. It has works wonder for me up to today. I'm glad that I'd listen to my parents early on regarding saving. You might try it if so see if it's fits you. Others do to the opposite, they do the budget first and the rest put into saving. I guess you have to try and experiment it yourself. And always ask yourself if you really need or just want it before spending your precious money.
Actually we do the same thing when it comes to savings, and it works for me too. I see to it that I save an amount of my income first before budgeting for my expenses.