As for the thing about Carbs forst thing, the body needs Carbs to provide energy, regulate Bloodsuugar and feed the Brain. Having them first thing will give you more energy and help you to wake up and should help kickstart your metabolism better, so storing thm won't be a major problem for you, unless you started increasing your Carb intake significantly during the day.
If you just switch some Carb intake to another meal, then it's just reallocating calories, not increasing, so you shouldn't find Carb to Fat conversion a problem
