I've copied this and pasted from when I posted about it ages ago
"I did this with DS1 when he was 6 months old. He was a TERRIBLE sleeper before then. Once he fell asleep - you couldn't move him - or he'd wake up and you'd have to start all overa gain, and the ONLY places he would fall asleep were
A) in the pushchair (being pushed around of course)
B) attached to the breast.
At nights he was sleeping in bed with us (not at all planned LOL) - and once he went to bed I had to go to bed as it was the only way to keep him even vaguely settled. He'd wake up hourly and feed for about 1hr - so I was feeling like cr*p.
When we moved to our new rented house when he was 6 months old we took the plunge.
I did CC as my HV advised..........
Put him down in his cot - on his own (with reassurance - but without looking directly at his face - just patting him while lying down) then walk out.
She said to stand there outside the door for 2 minutes (while they screamed of course lol) then go back in - reassure again - without picking up or direct eye contact.
Then leave the room go downstairs and put the kettle on and make a coffee. - That will take about 5 minutes - go back upstairs and repeat reassurance.
Go back downstairs and drink the coffee/tea.....about 10 minutes...repeate reassurance.
Go back downstairs and crack open the wine (yes honestly that's what my HV advised - and I did) - it helps ease some of the guilt and make it easier for you - as it's not easy listening to them - after 20 minutes return and reassure........repeat ad nauseum every 20 minutes until baby is asleep........
Repeat as nessecary during the night. BUT don't go rushing in the moment they make a noise - leave them 2 minutes first of all.
For the first few days the HV advised to try not to let him sleep too much in the day (to compensate for lack of sleep from his crying during the night) - and to use the technique for his naps too.....amazingly after the first night he settled well for his naps.
Well it was a bl**dy MIRACLE. OK yes - first night it was 2hrs and 52 minutes from first being put in his cot - but he finally went to sleep. He stirred once in the night....I crawled wearily out of bed and waited at the door - 30 seconds later he'd settled himself again. And slept the entire night!
The following night only took 30 minutes, then the night after that 10 minutes (with no waking during the night once he was asleep!). The 10 minutes lasted for 2/3 weeks (and by the end of week one I just left him for the full 10 minutes rather than doing the 2,5, 10 minute thing). Then suddenly he stopped - and it was 2 seconds of crying as I walked out the door of his room and then he settled.
It was a godsend. From hour long feeds every hour during the night, and a baby that wouldn't go to sleep unless he was attached to my breast (literally) to a baby that slept through........AND he suddenly became a happier baby - he laughed and smiled more than ever before because he wasn't so tired.