Sleep training

Who’s done sleep training? What method/s did you try? Was it successful? What about day naps? What age did you start?

My little one is 9 months old next week and still doing day sleep on me/next to me and co sleeping at night! This is the only way we get any sleep otherwise she wakes every 20mins :( she is EBF and has boob to sleep every time, she wakes 2-4 times a night for a feed but isn’t “hungry” more just doing it for comfort. She doesn’t have a dummy and never has had one.

If she falls asleep in the car or pram she will stay asleep as I think her sleep cycles aren’t disturbed but as soon as I hold her I can’t put her down.

My partner isn’t able to put her to sleep and I’m slowly burning out I need a break! Not a fan of the cry it out method but if it works I may have to try it, I want to try and set her up with good sleeping but I am majorly failing :(

Any ideas/advice/tips?!? O