it all depends on your lifestyle and the sacrifices you are willing to make.
some suggestions on here are great but will not work for everyones lifestyle
i know i could save a bundle not smoking, BUT i save money in other areas to compensate
you just have to work out whats good for you
best way to start is by listing your variable expenses, and go down the list one by one and think of possible ways to lower that cost if you cant live without that item/service
also determine what you can/cannot live without