7) Design smart and plan ahead.
Before you start picking out materials, create a design and plan a budget. Consider limiting the following: changes to load bearing walls, moving sinks and stoves, and changes to electrical and hvac components. If you are thinking of changing the layout or adding windows, consider the sunlight throughout the day and any views you may or may not want to see. If you measure twice and plan ahead, you will reduce mistakes and waste.
6) Donate used items to salvage shops and go shopping while you're there.
There's no reason to throw away old hardware, light fixtures, or cabinets. Call a salvage store to schedule a pick up or sell items on craigslist. You will be surprised how fast old hardware sells at a garage sale! Some salvage stores like Habitat for Humanity's Re-Store will give you a tax write-off. If you're at the salvage shops, look around for materials and hardware you need. Some stores even have brand new tools and supplies.