Easy way to fight akrasia with respect to saving: when your income increases, put half in savings. Do so through automatic paycheck deductions like a 401(k) to avoid needing to think about it. If you are currently getting by well enough, you don't strictly need that extra money, and the way to avoid unthinkingly frittering is away it to unthinkingly save it. If you get a 2% raise, increase your withholding by 1%. You still get a bit of a raise, and your savings increase.

This assumes "you are currently getting by well enough." If you have debts, paying down the debt is your savings. The interest rate on your credit card balance is higher than anything you can get through investing; stop the bleeding.