Miss Chaslyn,
Use professional products, start to finish. It will help save the integrity of your hair. Then make sure that you use a thermal styling product when heat styling your hair. It will help protect your hair from the heat of the irons. I recommend Thermal Defense from L'anza. I like it best because it does not flake, it does not build up on the irons and it's not too wet. It's just right! Use a moisturizing shampoo and conditioner for daily use and a protein reconstructor once a week. Try to sleep with your hair pulled loosely back or on top of your head and use a satin pillowcase (This will help avoid the friction that is caused by a cotton pillow case. This friction can cause damage and split ends.) Don't pull your hair while it's wet as this can cause breakage, too. Be gentle with it. You can even keep a wide toothed comb in the shower to comb your hair out while the conditioner is in it. Just be patient and take good care....there is no reason that you can't have your long hair and your highlights! Good luck!