hi there, I've had to do a similar thing with my dd. When she was 8 mths, she was eating 3 massive meals a day plus usual milk feeds, so I was confident she wasn't hungry.
I gradually shortened the feeds, so 5 mins the first few days, then 4 mins etc. The plan was a bit waylaid when she was ill or teething. But after a couple of weeks, her feeds were down to 90 secs and I knew that she didn't need them.
I would also agree it's important to put baby down awake in the cot after the feed. Stop feeding before they fall asleep.
Then when she woke up I just picked her up and cuddled her a bit, then the next step was just patting her in the cot. Sometimes dh went in and did that, but I think we started that step on a Friday so he wasn't too tired for work.
Anyway, a bit long winded but we managed it without too many tears. I still do feed her a bit when she's ill or teething, but generally it's a no feed policy at night now.
It hasn't miraculously improved her sleep,being ill or teething still means she wakes up and sometimes I don't even know why she wakes up but it is better.
Good luck, I feel a hundred times better the nights I get 8 hrs sleep, it's hard work, but totally worth it.