I've got ceramic ones too. The damage depends on how often you're planning on using them. I must use them less than once a month, and that doesn't do a lot of damage, but i used to use them a lot more than that, about once a week or more, and i could see the damage from that. Also depends how damaged your hair is from other styling, such as colour and blow drying, as it'll already be weakened from that. You can get protective serums and stuff like that to smooth on your hair and protect it from too much heat damage, but i don't bother since i don't use them much. Also, only ever go over the hair sections once with the straighteners, this will prevent damage. So move the straighteners from root to tip fairly slowly to make sure it straightens properly, and you don't have to do it again.
To straighten the back of my hair, i part it to either side, then straighten one side at a time. I just pick up small sections starting from the very back, straighten it, and let it fall down my back, so i know which hair has been straightened. My hairs long at the back though, so it's not as wavy there as it is at the front. So i usually just straighten the front and sides fully, and pick random pieces from the back and underneath. It still looks fully straightened that way, and causes less damage.