How I feed my leopard geckos
I don't typically feed mealworms to either of my leopard geckos, just as a last resort if they won't eat anything else. I would put a dozen or so in a plastic bowl and leave them there. I only did this with Jubjub though, when I noticed he wasn't catching any of the crickets. Bahamut won't eat mealworms at all. Now I alternate between crickets and superworms. The mealies are just too much more trouble than they are worth and they hardly d anything for the geckos nutritionally so I don't bother with them anymore.
With the crickets, I use tongs most of the time. I dunk them in calcium powder and I give the geckos as much as they will eat. Sometimes Jubjub will eat a dozen large crickets in one sitting. Sometimes I let the crickets loose in Jubjub's tank, especially when I am not going to see him again for a while. I never do this with Bahamut, though. He lives with me at my home so I can give him bugs whenever I am there.
With the superworms, I just drop them in front of the gecko's nose. They will eat the worms when they are hungry and leave them when they aren't hungry.