Free your home from these unwanted housemates. These are suprisingly effective. I have trapped up to 3 rats inside, one 1.25L bottle in a night.
If you intend on letting the rodent go, simply cut the tape and remove the funnel. Make sure you drop them off far away from your property or they will return.
However if this is not an option or you feel the need to permantley dispose of the rodent, I would recommend a simple bucket of water. Put the bottle in and put a brick over it to submerge the trap. Walk away. Come back when all the drama is over and dispose of the entire bottle. Preferably empty cotents and recycle / re-use the trap.