Question: How can I ease my mind and make sure I DID remember to lock my door and turn off my oven when leaving for a long trip?
Options:
Use your ink pen and either draw a selfie of yourself as you lock and turn off, or take a rendering of you forgetting it.  If your mind stresses you just review it.
Use your phone and either take a selfie of yourself as you lock and turn off, or take a video of you doing it.  If your mind stresses you just review it.
Answer: Use your phone and either take a selfie of yourself as you lock and turn off, or take a video of you doing it.  If your mind stresses you just review it.