Save by the paycheck, not the month
If you’re paid every two weeks, a monthly savings number is awkward: some months have three paychecks. Saving a fixed amount from each paycheck is easier to stick to, and the third-paycheck months get you ahead.
Set it aside before you spend
The money that gets saved is the money that leaves your spending pile first. Move it on payday, or earmark it so you don’t count it as spendable.