X is the difficulty of the lock (0 - 100).
If something is attacking you, it will stop.
This is a good indication you've selected what you are looking to manipulate.
You will see a code come up in the middle of the screen that is the objects id number. means you actually need to click on the specific thing you want to interact with while you are in the console window.
You can go pretty high with the Carry Weight number, so feel free to jack it up to over 2,000 if you want! Skyrim Console Commands List