I use supplies from toro...1/4 inch tubing and misting nozzles hooked right up to my laundry tub with a lawn sprinkler timer controling it all. I only use water from the hot tap..with the fine mist its just warm when it hits them. Fot the most part they enjoy it.
Use pure hot water...it cools off as it mists..byt the time it hits them its just warm. I run a misting system straight off the hot water tap and they usually will sit directly under it cause its warm for them.
Picking them up doesnt necessarily get them used to you. You occasionally need to pick them up to do health checks. I think some just learn that you are the food giver and therefore they see you as a good thing.
Mine get 30-45 minutes a day of fine hot water mist. I free range crickets. I put them all in at once...they graze all day. With babies i let them eat as much as they want. Get the biggest food yours can handle...unfortunately the younger the crickets the more easily they die. So if hes big...