My LO wouldn't take a dummy when I had tried it before so would persevere with very tearful starts to some naps and bedtimes if we missed the sweet spot for putting her down.
In the last couple of weeks she had become increasingly difficult to settle, wouldn't calm when shushed and stroked etc so tried the dummy again.
It's magic!! Just a few sucks and she is calm and a few more and she's asleep.
So much better than the crying, rocking, boob to soothe etc. I'm only using it when she's winding herself up and taking it out as soon as she's dozy hopefully before she's asleep but im terrified of her becoming increasingly dependent and it becoming a rod.
I don't think it's too late to bin if posters recommend, will just have to persevere with self settling without.