Simple answer is the lowest level of security possible.
You live alone, so I would say use a safe, but when you are home the safe door can be unlocked and ajar. Carry gun(s) can be left on a counter or side table where handy. You only need to secure everything when you are gone or have guests in your home.
As empty nesters my carry guns are on the desk, reading stand, night stand, dresser, etc. when I am home. I just empty my pockets and holster of most items. The gun room door is often unlocked when I am home. However, when guests are coming over for a stay everything changes back to a "childproof" situation whether there are children or not.
During the work day I carry both my 1911 and LCP. Due to the businesses I visit the 1911 spends most of the work day in the car. I have a Nano safe cabled to the front seat frame that the 1911 resides in, and the LCP will also fit if need be. The key is stored in the lock, and the safe is unlocked when I am in the car. When I stop for a call or get pulled over by the red and blue flashers, the key is turned to lock and comes out. Simple, easy and quick.