Declutter your home. Go room by room and go througn your clothes, household items, kitchen supplies, and so on. Get rid of everything you don't need, haven't used in 12 months, or you don't want anymore. Box the items up and give them away right away, don't hang onto them.
Downsize anywhere you can. If you can swing it, go down to one car, try to go through your clothes and household goods one more time and if you don't love it or it doesn't make you really happy, get rid of it.
Learn to save money/ be frugal. Learn to make your own laundry soap, dishwasher soap, clip coupons, will all help save money and allow you to live much more simple.
Don't worry about 'The Jones'. Don't compare yourself to your neighbor or anyone else for that matter.
Be thankful. Be thankful for what you have and focus on the blessings you have in your life, this will help you desire a more simple life and will help you see what is really important and focus on those things.