I heard once that flat ironing damage can "travel" up to your new growth...e.g. split ends will keep traveling up if you don't cut them. So I'd advise you not to flat iron your ends excessively. Also, I think transitioning is a good time to start practicing healthy hair habits for ALL of your hair -- so minimal heat is optimal. Good luck!
Originally Posted by DeeinKC

Leaving the heat now, will help you not use it when you are fully natural. Start practicing now. Transitioning is also a time to practice curly styles. Since you want it to be curly, try doing a flat twist out (or a regular twist out). You won't have to use heat to flatten and then curl, you will just have curls!