When going out of the house to do a photo shoot, check to see if all necessary supplies are present, such as memory cards and a fully charged battery.
I went over to my friend's house today to borrow her baby for a bit. I brought along 6 blankets. I had hoped for more but I ran out of thread yesterday just as I started sewing. We got baby all set up, I turned on my camera and it told me "no memory card." Oh dear. Luckily she had an extra so I popped hers in. Whew!