I nursed my DS most days until he was 3 months old. He just would not settle, I feel that babys need and want to feel the comfort of mum, as often as they would like it. DS soon adapted much later to go into his cot for daytime nap, but this only lasted til he was around 5mo!! He is back to the old routine. But i figure, they are not babies for long, and i am just going to enjoy holding my little man while i can. Especially since he is quite happy to have a great night sleep in his cot. I think that the bed time routine is the most important IMO. We religiously gave DS a bath, and bottle, then bed by 7.30 every night, and it has worked a treat so far. He may have the very odd occasion where he wants to stay up a bit, but this is usually when he is sick. So we let him play, then pop him in his cot again later. I never want to get into the pattern where he is sleeping in our bed if we can help it, as it is soooo hard to get them out of that habbit. IMO of course!!
Good luck, do what feels right for YOU, and just do whatever works for you. Mum knows best i say!!!!!