Stefka, just also read your other post - how does DS nap in the day? is he maybe having a long nap too close to bedtime? how many naps does he have and for how long? - does he go down ok for these?
I can't pretend to be an expert, as DS 11mo still not a great sleeper, but like you, I read lots of books to try and find the answers and wish I'd started to trust my instincts a lot sooner! - do you BF or is he FF? - just that you'll read everywhere don't BF to sleep or they develop sleep associations...yes exactly what lovely mother nature intended with the lovely hormones that are supposed to help your baby (and you) sleep, so I wouldn't worry too much at this stage about feeding to sleep if that helps him go off.
If you do want to help him go in the cot awake though, you could try cuddles once he's been fed, until he's relaxed enough to put in, sleepy but not yet dropping off, then keep a hand on his stomach, or gently stroke his head/face - (but what works well for one baby could wind another up).
He probably won't get it over night, but if you persevere, be consistent and try and enjoy your time with him, he should get there soon. Might help if you don't plan to get anything done for a few eves, so you're not stressed about getting down too early, try and have easy tea planned and try and relax yourself. (If DH/DP is around at bathtime, try a bath with DS, see if that helps him relax?)
good luck, you will get there, let us know how you get on!