Hi there
Firstly I just need to ask when you mention doing check in at night at certain intervals is he crying for that time? Just to clarify that we cannot support controlled crying on this site as Tracy believed it breaks the trust between the parent and child.
I remember that aching back feeling from my first daughter and rocking her to sleep constantly and totally understand why you want to wean it.
The best method to use instead would be shh pat and I have attached the link for you to have a read of to see how to do it. You would use this for all naps and BT.
If he's always been rocked it will take a while for him to get used to the new way of falling asleep so you will need to be persistent with it.
Shush-pat - How toIf you have any questions or want some hand holding please do come back