My DS was a nightmare at 6 months, to the extent that I was regularly in tears at 'bedtime' and I was so exhausted that sometimes I felt like I could throw DS. He'd wake up to 10 times a night (between 10 and 6ish) I'd spent the last 6 months responding to every cry and I just couldn't take it.
I let DS CIO one night when I couldn't take any more. When I tried turning it into CC (several times) he just got angry when we went back into the room. After 6 months I knew my baby well, and it wasn't an upset or hurt cry, more angry / grumpy so I left him. We let DS CIO for long enough for us to get him waking 4 hourly and sleeping 12 hours. The worst crying (max 45 minutes with CC, 20 with CIO) was over within a few days, and after the first few weeks we haven't let him cry for more than a few minutes.
I read that crying increases cortisol levels, but I also read that sleep deprivation makes babies less able to clear their system of cortisol. I found so much conflicting advice that I decided to watch my baby instead. I couldn't see any signs that he didn't trust me - in fact as he was sleeping more he was noticably happier.
When DH and I were less stressed ourselves, we moved back to the kinder settling methods, but we really needed that time to get over the worst of it and not be near breaking point.
I completely understand people who say you should try other ways of settling your baby, and that they can be genuinely hungry (at 9mo my DS has 1-2 night feeds). I also get frustrated at people who expect young babies to sleep through the night, but I also know that at some point you've got to start getting a bit more sleep to see you through, especially when you're at work. (Our business got a fine at work because I did everything to file our EOY return but didn't actually press the button to submit it because I was knackered!)
Anyway, if you've got the energy to try some things from NCSS, or something more gentle like Pick Up / Put Down, then try that first. My best practical tip is to watch your baby during the early evening and try different bed times as soon as they show any signs of tiredness. I had been trying to put DS to bed at around 8 but we'd fight about it for hours! From the beginning, bedtime at 6 (which he still does) was much much quicker, and most of the time we still feed DS to sleep.
Good luck, and I hope you find a technique you're happy with.