What steps do you take to better protect yourself in the case of a home invasion or robbery?

Don't be one of the dumb-asses who put a red light on their porch to denote a gun-free house.

If you have a nice bike - like a 5K triathalon bike, put the chain through each wheel and frame and on something that requires a torch to move. Same for a motorcycle. Get better locks. If it can be duplicated at home depot, you're wrong. Have strong doors with hinges on inside. Use security bars on your sliding glass doors and other windows so they cannot be forced open. Have 45 ACP hollows with your walther, glock, colt all around the house in concealed biometric safes. Don't give keys out for your home to girls or your boys all the time. Shoot first then ask questions if someone is in your house. Make sure one of those weapons is in your bedroom, loaded, and ready to go (chambered or not depending on your comfort level with that, good place for the AR.

For the home, I recommend a reliable and monitored home security system. And keep it activated. At least if someone does break into your home some entity (you and fire and or police) will be alerted.