I make chicken enchiladas all the time, it is extremely easy! There are two different ways.you can sear it in the pan until it is cooked through, then pull it apart so it looks like it has been shredded kind of, then you place it in your tortillas and pour sauce on top of it, or you can take your enchilada sauce and put it in a pot and add the chicken, along with any other seasonings. I sometimes add corn or kidney beans, then take that and fill the tortillas. email me if you need anymore help!
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edit: also use chicken breast. If it is frozen let it thaw out naturally under some warm water, don't microwave it.