PS, sorry for mammoth posts, but meant to say (DS asleep again now), absolutely don't do CC if you're not comfortable with it, I wasn't when he was younger, despite everyone telling me that it was 'the only way to go'. Tosh, you know your baby, and you know what you're comfortable with, so don't be persuaded unless you're really happy to give it a proper go. Half arsed CC is torture for both of you, you have to stick with it to see the benefits, otherwise you've just put you and DC through weeks of crying for nothing.
I really sympathise, as I was told by everyone that a routine would fix everything, and we still had no obvious routine at 7 months. My sis kept ramming bloody Gina Ford down my throat ("well it worked for my 3 DC"), and my mum even said she thought there might be something seriously wrong with DS! Really helpful... It does help to read the books, even bloody Gina, as they all have useful info you can cherry pick.
Also, I'm still BFing throughout the day, to help him drop off for forming nap, and to calm him down when he's upset, mid afternoon before and often after nap. Still trying not to feed him once he's gone into his cot for the night, but am finding it v useful to calm his teething pain.
My DS happens to be a big screamer, to the point where my mum friends still comment on what a happy boy he is these days, in stark comparison to a few months ago when he was basically screaming all day and most of the night.
Before 7 months we literally had no routine at all, daytime naps were all on me, so if I moved or tried to put him down he woke, aaaargh. Also he didn't wean til 7 months either, as he gagged on solids til then.
If you do get him to settle at 7pm, you'll get your evenings back, and that made a huge difference to my sanity.
Very best of luck, hope my waffle hasn't bored you to tears...