Eat the same thing, or almost the same thing daily.
Plan in advance
Prepare your food
Always have an extra shake and nuts and rice cake with you in the case you can't get your next regular meal in time
Learn to track your calories, carbs, prots, fats. It doesnt matter which website you go to in order to get your nutritional infos but then stick to that website for the food you are eating
Take pics and measurements every 2-4weeks to evaluate progress and adjust
Know that the "problem" is most likely related to your eating/recovery and not the training itself when you are not getting the results you want
When a bodypart is lagging, then its training/genetic related
Don't get fat.