Step 2: Modify Trap
You do not want the mouse moving around and working on the bait without the trap going off. To do this, straiten up the trigger latch to a point where you can no longer get the trap to set. Then bend it back just a little.
This will create a hair trigger on your tarp. When the mouse so much as sniffs the bait, it will go off. This is very important.
It is also very important to watch your fingers once you have made this change. The trap will go off when you least expect it. Just carrying it around may cause it to trigger. Hold the trap on the sides on the end where the bar is located when the trap is set. If the trap happens to go off while you are holding it, the bar will not hit you. You will drop the trap and the bait will come off but you will be safe.