Or does one select the actual image in Gallery?
Why don't you try?
There are two ways you can transfer your pictures from the tablet.
1. Connect tablet to the PC using the USB cable that came with the charger. You will the see a notification on the tablet "Connected as a media device". You can then access the files on the tablet from the PC. If you are using Windows 7 it will look something like "Computer > Nexus 4/10 > Internal Storage > DCIM > Camera" to get to your pictures.
2. Open the Gallery app on the tablet, select the pictures you want by long press, a menu will appear at the top of the screen with a symbol looking like three dots connected by two lines. Press that and a list of apps will appear, select the one you want and Bob's your uncle.
It's like Nike said, just do it. It wont explode.
P.S. There may be a 3rd way, as it is possible that your photos have been saved online. You will likely have an app named "Photos" and depending on your settings your photos may have been saved and be accesible online via your Google account.