One of the best couponing tips to save money is match coupons with B1G1 sales. If you have a B1G1 coupon to match w/ the sale than most stores will ring up the items as free. Because the store is offering 1 for free and the manufacturer coupon is paying for the other.
Another tip, is always clip toothpaste coupons. You will rarely pay over .50 for top brand toothpaste and most of the time it will end up FREE after coupon matched w/ a sale.
And one final thing...just because you have 10 coupons does not mean you need 10 of something. If it ruins before you can use it, then you have wasted time and money.