mealworms arnt great feeders overall, but are readily available and cheapish. Ive done reasonably extensive tests on frogs and they seem to cope fine on them.
just feed before 2pm so the herp has time to digest them before sundown, and make sure ample daytime temps.
i find it best to feed crickets and locusts as the staple, flies and mealworms 2/3times a week.
given live food in nz is expensive, best to breed your own crickets and locusts if you have the time and patience. mealworms i buy in along with flies as theyre cheapish so i dont see the need to breed them. + flies breeding/traps can be smelly, mealworms (more so the bran) can trigger allergies like hayfever if your prone to that sort of thing..
no need to hand feed, just chuck them in (not in the water obviously) or in a bowl that the mealworms cant climb out of.
i have glued the above plastic bowl to an ice cream container lid in the past so they dont tip it over, thats the flash version