Yes, give her a break. You are always going to get polarised opinions when it comes to discussing CC. Those it worked for really recommend it. But there are also those who tried it and it didn't work (us included). And those who simply wouldn't let it enter their heads. We're all different in our approach. But when you're absolutely desperate, it's support that the OP needs. Yes - tell her how you do things and what you've found work for YOUR kids, but please remember that every parent and child is different and there is no "right" way to do things.
I think the best thing to do, Bean612, is to trust your instincts. If you want to give CC a try, then read up on it thoroughly first so you know exactly what is supposed to happen. Get the support of your DP/DP/mum when you're doing it. It IS horrible listening to them cry, so you will need an adult there for you to go and offload onto.
Be aware that CC just doesn't work for everyone, no matter if you follow it to the letter. In our case I suspected things weren't going to plan when the crying and unsettledness got WORSE when going through CC. After a couple of nights poor DS would get hysterical as soon as we started going upstairs to bed (he had never done this before), he would fight and kick in terror of going in his cot, and eventually would vomit with fear and upset. This is NOT what is supposed to happen with CC! My SIL had none of that when she did it with her son - he was a textbook successful case!
I only found out on a medical website months later that for some very sensitive children, CC can actually make their sleep problems worse. DS1 was and still is an extremely sensitive and deep-thinking kind of child.
I do think it's very hard at 7 months to know exactly why they are crying at night time. Teething pain might get worse when they lie down for all we know. Or they might just need extra reassurance and cuddles at night at that age for some developmental reason. I think it's important to consider that they are not necessarily being "naughty" - they just can't tell us what's wrong.
Consider all those things and if you think you should give it a go, give it a go! if it doesn't work or you decide it just isn't for you, look into other ways of improving the sleep problems.
Best of luck!