My husband spent four nights doing the pick up put down method with the baby whilst I slept downstairs. I was on my knees tired and there's no way I would have kept up with it. Baby actually took to it far far better than expected, especially considering he's a clingy, boob obsessed velcro baby who's only ever fed to sleep.
So before bed- no feeding completely to sleep, but have been using it as a cheat to make baby sleepy. I've been feeding him upright in the living room with the TV and lights on. Once he's finished feeding it's time for the sleep cues- upstairs, the dark, white noise machine and getting baby into sleeping bag. A cuddle and walk around in the dark until he's very sleepy. Then hand over to DH for pick up put down.
Husband said the worst of it was during the first night where at one point it took about 2 hours of putting baby down, picking him up if upset and giving him a cuddle until calm, putting him down again and repeat. Baby woke every hour as usual that night but I wasn't allowed in the room, husband settled him with cuddles/rocking/walking around. There was some crying on the first night. The worst of it was 20 mins of crying while DH cuddled and rocked him. The second night DS slept 8 hours solidly!
Also I've been making sure all naps are in the cot too, using the same method. I still miss him though. When he's older he'll be welcome in for night time cuddles. It was just getting a bit too much with waking every hour. He had bags under his eyes too!
I think the key to it was to send in DH. He's obviously not worth waking up for as baby has gone from sleeping 1 or 2 hours at a time to 8 or 9. He's also stopped feeding all night and is only waking at 4/5am for a quick cuddle now. If he's hungry I'll get him up, pretend it's morning and feed him. Then give him an extra nap in the day.
I genuinely think he had no idea that he could sleep all night. I think the cot helps as he knows I'm not there with milk. We leave a sippy cup of water in the cot in case he's thirsty in the night, but I don't think he's used it yet.
Sorry this turned out much longer than planned. Could have just written "pick up, put down method by DH" 