We DIY anything we can possibly do ourselves, and that's just about everything.
We have never spent more than $4000 on a car and keep them as long as possible. I had my last car over 30 years, 400K+ miles. We do all of our own repairs and maintenance (oil changes, etc.). I just replaced my timing belt and an engine mount earlier this week.
I enjoy woodworking, so I built all of our cabinets and the vast majority of the furniture in our house. For that matter, we built a garage in 2001 and built our own house in 2004.
I mow our own yard and maintain the equipment myself.
I fix appliances whenever possible. My mom gave us her old washer/dryer and we had them over 30 years. I repaired them several times over the years. We finally had to buy a new washer/dryer set when the washer tub rusted through.
I cook most meals myself, though we do eat out on occasion as a treat.
We go hiking or take overnight getaways within a couple hundred miles of our house, rather than taking big expensive vacations to far off destinations. A few hundred dollars vs several thousand.
My wife cuts my hair, and her own.
I'm not a big coupon clipper, but will use the $10 off $50 type, or scan the digital coupons in the store. I NEVER buy items just because I have a coupon or they are on sale. Unfortunately, I still waste too much money on impulse buys at the grocery store (those cookies sure look good).
Of course, I handle all of our finances and investing myself. We use a CITI 2% cash back card for all purchases, except gas (they charge 10 cent more per gallon for credit). We have not paid a dime of interest in over 20 years.
I cancel any services I am not using (magazines, streaming TV, etc), or change my plans to reduce costs. I just dropped the DVD portion of Netflix ($10/mo less), and switched to a cheaper plan on my VOIP phone service ($7/mo less). Every little bit helps.
We rarely buy clothing, but when we do they last us for many years.