i tell junior mechanics and apprentices that you dont have to know everything, you also will sometimes make stupid mistakes when fault finding but its up to you to learn from it. get the assistance when needed but learn from it. i also say sometimes things cant be explained ie lifts reset or faults clear for no reason and all you should do is just move on, plus dont take troubles home. you have to have a healthy care factor whilst doing the best you can for your company and clients but if you burn out it helps noone.