Bones from takeout fried chicken work great! I tie them to the trap trigger plate.
Some raccoons are smart and try to reach for the bones from the side of the trap. The trap springs, but has no critter. So I put the trap into a black plastic trash bag, or some boards on the sides. Leave the opening of the trap clear and free. That usually works. By the time you come back, the raccoon will usally have pulled all of the plastic back into the trap with him!
Yes. Stake down the trap. I've had a raccoon in the trap in the morning when I didn't have time to tend to him and come back to see he was able to move the trap 30 feet up the driveway.
One raccon, I called "The Mechanic". He laid down on his back in the trap and reached for various parts of the trap door and latch! He had also removed some of the metal covers. When I approached him, he stopped and pretended he wasn't doing anything. Theoretically, he could have eventually lifted the bar that held the trap door down to escape! If I was a raccoon capable of abstract thinking, I would rock and roll the trap over, so the bar would fall off the door, then push the door open. One of these days a raccoon might figure that out through dumb luck and teach others that behavior.
I wedged a brick on the trap door to prevent further tampering and went inside for some tools to dispatch him. One less raccon who will not spread the knowledge to his peers.