I don't have the will power for sleep training
This is precisely why I suggested a sidecar cot. It's clear from your posts that you are at the end of your rope. As much as you want/need baby's sleep to improve, you don't have the energy to invest in all the distress involved with sleep training. And that's OK.
A sidecar cot is not cosleeping but it's a million times easier to settle the baby independently in a sidecar cot.
What about buying a single bed for baby's room? It's not a wasted purchase because your DC will soon enough need a single bed anyway. But in the mean-time you can lie down and sleep while dealing with baby's wake ups.
If space is an issue, as I said previously, move furnature around or out of the room completely to make it work.
Now at 6 months he refuses to go down once asleep.
This encompasses the central problem here.
Good sleep habits begin amd end with the fact that baby must - MUST - go to sleep where they stay asleep. You will not get any good sleep habits from getting baby to sleep somewhere that isn't the cot and then putting then down into the cot.
You could:
(a) rock baby to sleep in your arms and then maintain the sleep with baby in your arms. That's baby going to sleep where they stay asleep. But it's not independent sleep - it's dependant on you. Or
(b) teach baby to go from awake to a sleep in the cot. This means that once baby (finally) goes to sleep there is no moving or putting baby down - they just stay asleep where they went to sleep.
As to how that happens- yeah it will be hassle. Three things will help though:
- the dummy to reduce crying
- your husband can help because going to sleep is not relivent on feeding
- a sidecar cot makes everything easier to deal with when your doing this at 3am (having only dropped to sleep yourself at 2am and knowing you'll probably be awake again at 4am...)
The idea is to do all the settling with baby lying down in the cot. So you don't leave baby to cry, ever don't comfort baby. You feed, wind, put down.
Then you (or DH - Involve him) lie on your bed next to the cot. Some things that might help in-cot settling:
● from your bed, lie the top half of your body close to baby's
● put your head/face close to babies. This is important since it evokes the sence
- baby can feel your breath on his cheek
- baby can hear your breathing in his ear
- baby can smell you close
- these sence tell baby you are still there even when he closes his eyes and can no longer see you. It keeps the reassurance going.
● use one of your hands to hold both of his, so you still his flailing arms.
● if needs be, position this hand (with his hands) over his hips to also still leg bashing. You often need to actively teach babies to still their bodies, it doesn't always come naturally.
● use your other hand to cuddle him.
● some babies like rhythmic patting
● some babies just like to know you are there by feeling your hand on their chest
● some like face stroking
● some like long shushhhhhhhh sounds. Others like quick syllables- sh sh sh sh. Others like silence
● reinsert dummy as needed. Make sure baby actively takes the dummy rather than it being passively in his mouth.
● Tap on outside of dumny to encourage sucking if crying starts.
Then it's just a matter of Don't Give Up. Just keep going. Stay reassuring, stay calm, stay patient. Always the same - consistency is key. Do the same thing every wake up, every bedtime, always the same.