Method wise:
I never got on with shortening feeds because I never found the feeds were a consistent length to begin with, plus I couldn't cope with clock watching when half asleep. Came to the conclusion breastfeeding doesn't really work like that and this is ridiculously stupid advice from sleep consultants who are just transposing a method from bottle feeding.
Separating breastfeeding from falling asleep had no effect. Whereas it defo did with my older one, but he was in a single bed rather than a cot so he still had me there.
Adding a comfort object, familiar song in the hope that he'd be able to rely on these sleep cues rather than breastfeeding - no effect. He is totally unbothered about whether the other cues are present and only cares about the milk one.
Gro Clock is nice and he likes saying goodnight to the sun, but he doesn't wake up, see the blue star and go back to sleep. I think this will be of more use when he's a bit older.
Semi successful:
Having a kind of "curfew" for his bedroom - I try whatever it takes (repeated feeding, ssshing, back rubbing, etc) to keep him in his own room until 3 or 4 am and only bring him through to our room at that time. To be honest I get fucked off with this if/when he doesn't settle at all so only ever had a success rate of about 50%. What's keeping me going here is the thought "This is only going to be harder when I have a bigger bump". So if you don't have a deadline in the same way it might be tricky.
Sarah Ockwell Smith method recommended to me on reddit and then I read it in her book :o For this she recommends feeding as normal at bedtime, but then for all night wake ups delaying milk on the first night by 5 minutes. So you do whatever comforts them for 5 minutes and then if they are not settling, give them milk. The next night 10 minutes, the next 15, etc up to a max of 30. I was a bit sceptical of this because IME nothing comforts DS2 if he wants milk. But I managed to get to 7 minutes (I was too much of a wuss to attempt 10 on night 2!) and found that he was comforted, even though it wasn't really what he wanted, by being sat down and rocked. He still cried during it, but not in an escalating way and he wasn't constantly scrabbling for milk - he did a couple of times. This is what I'm planning to pick back up over the next couple of days.
For some reason, clockwatching this end of a feed is easier for me and so I have stuck with it better.