I need to sleep train my daughter she is 6.5 months old. 7 months on the 30th January. How did you sleep train your babies and how long did it take?

I am severely sleep deprived shes feeding in the night an I'm certain its for comfort not for hunger. So did any of you when off feeds too and how? My first daughter did it all on her own by time she was 10 weeks old. So this is all new and I'm at a loss of what to do