Hi OP, we did CC (Ferber method) with our DD when she was 6.5 months old as we were past ourselves with tiredness, and frankly I was a broken woman and needed some goddamn sleep...!
Took an hour of doing the Ferber method (leave for 2mins, go in to comfort for 2, leave for 3mins, comfort for 2 and build up to leaving at 10 mins at a time) for her to go to sleep for 4 hours - the longest she had ever slept at that point! And then a further 40/45 mins twice over to get another set of 3 hours a time.
We considered that a huge success, and when we put her down the following evening she slept though for 12 hours; we woke up in the morning, realised she'd not woken up, completely panicked, ran into her room only to find her still asleep!
It worked for us and she sleeps through to this day (13 months old).
I never worried about the whole 'ohh no you can't leave them you'll damage their development/Romanian orphanages blah blah blah' because you're clearly not subjecting your child to months/years of emotional and physical neglect which is what the studies people love to quote is based on, all you're doing to teaching your child how to self-settle, and with the Ferber method you're still comforting them.
Give it a go, see what works for you. Good luck
xx