I agree you are doing it if you are even trying! This is my first attempt at EC. My DD is 2.5 months old now and I've been at it for about a month, as best I can. I also have an older daughter (26 mo) who we are just now gradually preparing to potty train, so I really hear you on it being tough sometimes to pay as close attention to the baby as I would like. Fortunately I get a lot of help with child care from her grandparents and usually have some uninterrupted time with baby during the day to really pay attention to her.
We currently catch an awful lot of the poops, but not all (she can really grunt or fart a lot and NOT poop, then sometimes poop later unexpectedly or while nursing). Mostly I go by timing or intuition, because there aren't many reliable cues I can discern at this point. A majority of the post-nap attempts are successful, maybe 75-80%, and I don't know how many of the other random attempts - maybe 40% or so. I do know that she often pees while nursing, but the one time I tried nursing while holding her over a receptacle she really hated it (and I can't say that I'd blame her!). I would like to find a way to encourage her to hold the pee until after she's done nursing.
I have to agree with PP who said that just having no or fewer poopy diapers is awesome. Even with incomplete success I have soooo much less poopy laundry now!!
We are currently using disposables. I wondered about changing to cloth or gDiapers sometime in the next few months and whether that would allow her to feel wetness more than she currently can. I assume that the ability to actually feel wetness might encourage her to become more aware of bladder control, because she can learn the consequences of peeing. But then I am not sure how much extra, daily laundry I am up for - I need to keep this manageable for me, too!
Anyway - I definitely notice that some days I feel like I am doing pretty well catching stuff and other days I feel like I suck at it. I remind myself that the important thing is to just keep trying!