Grab the feeders with your fingers then crush it's head with a pair of tongs. Then place the feeder in the container where you want it with the tongs. If the meal is slightly larger then what is needed prekilled works great. Nice big meal and no worries of the feeder injuring your T or giving it a scare causing it to not eat at all.
I've been doing this lately for my little guy because the store has been out of small crickets. I was able to corral the cricket in the bottom of the bag that it came in and then reach in the the tongs and grab it by the head.