libra - what a great post. spot on.
i also have 3mo and i am lucky - she sleeps in the evening and has gone through the night for the last 2 nights (woo!)(shame i still wake up at 4am... d'oh).
however, she just doesn't nap during the day for more than 40mins, so i think you get some things "working", but can never have everything perfect with a little baby (as camgirl pointed out)!
green - i don't think you're being selfish to want some time to yourself to recharge and want less stressful evenings.
i don't know if it'll help, but dd was very grizzly all evening until i started taking her into a warm bath with me at 6pm for half an hour (works so much better than baby bath) and we have a very set routine of bath, feed, swaddle, white noise, low lights and rocking chair til she's very sleepy when we put her down in her cot. she now takes these as "cues" that she's allowed to sleep and goes out like a light. also, we have to put her in her nursery 7pm-10.30pm otherwise the tv, lights, chat etc keep her awake. we move her to moses basket after her late feed.
if we're not at home and don't do the routine then she just won't sleep, she fights it because she's so interested in what's going on around her and gets upset. it means we can't really go out in the evening, but i go to bed by 9pm anyway - i'm knackered!!
we have never had to do any sort of cc, i think extra cuddles work better for us.
i've no idea if we're setting ourselves up for problems later on with sleep props, but it keeps us sane and dd happy.
good luck