The rule of thumb in retirement is that you have to adjust to a lifestyle funded by 70% of the income you used to have. The Wall Street Journal reports that such a downsizing is easier to absorb if it's framed in a positive manner.
The positive framing would be how much you can carry along from pre-retirement. That might range from staying put in the family home to being able to dine out once a week.
The negative way of framing would be to focus on the 30% cut you have to give yourself. You would focus on the biannual trips to Australia you can no longer take as well as the getaway at the Jersey Shore you might have to sell.
Obviously, the 30% point of view can be the platform for an unhappy retirement. If you can't endure that, the solution might be to work enough to generate enough money to fill that 30% gap.