I'm not an expert, but have had success with this recently. Honestly the benefits are huge. Alex always falls to sleep within half an hour and rarely wakes during the night, if she does it's either teeth or wet, and always is back sleeping within half an hour. This is from someone who has been an 'accidental parent 'for 1 year Please hang in there and take advice from these wonderful ladies, I owe them my sanity. It will work, stay calm, it may have taking 3 hours tonight, it may be 3 hours tomorrow, but it will get better, honest.
Good luck.