CC is such an emotive subject and you will always get such opposing opinions, I think you have to do what is right for you and your child.
I have twins, the one has always slept like a dream and when he is upset in the night, we can go to him, give him a cuddle and pop him back down and he is back to sleep.
His brother is totally different. He has never slept easily and we have tried everything, patting to sleep, sitting in the room quietly, going back every time he cries saying nothing....none of it worked and it seemed all we were doing was waking him up more and distracting him from his sleep.
In the end we did CC, it was awful at first, I stood outside his bedroom door crying myself, it went against everything I felt as a mum wanting to comfort him. We have camera monitors so I was able to watch him the whole time and make sure he was ok but we didn't go to him. I'd say it went on for nearly an hour, but he did fall asleep and when he woke in the morning he was is usual happy self.
The next night we did it again and eventually he hardly cried at all.
Now, he goes to bed most nights quietly and happily, he sleeps through and is happy in the mornings.
It was horrible but I truly believe that letting him cry was the best thing I could do for him. Also, you know your babies cry, if it's wingey and moany, you can leave them...if it's genuine upset that needs dealing with, you make a judgement and go to them.
8 months might be a little young, we started about 12 months.