I've ECed all of mine. I feel like they were all naturals at it. I've heard babies who don't like to be wet can do better, but none of mine cared about being wet and they still did great.
Signs are something you can observe and get to know. There is a certain kind of grunting that is hard to describe (but I can tell when strangers' babies in public places need to go potty
). Some babies have individual signs, too. It also doesn't hurt to just take them potty a bunch and sometimes there is just intuition- you just know they need to go and they do. Babies pee all. the. time. so there are lots of chances and chances are if you take them they will go.
I put my kids in cloth diapers (prefolds and thirsties duos) and they still get peed in a lot. I'm not one of those "baby never has an accident" ec moms. Mine still pee in their diapers plenty, but they also go in the potty plenty. But we get all the poop in the potty by 2-3 months.
Routine changes. . . well mostly you just add a potty stop in when you can. So they wake up and nurse right away, and then after that potty. Or just take her when you change her diaper or right before nursing to sleep. Take her before you go somewhere and as soon as you get home (if she's awake). I don't like to disturb babies to have them go potty, so for example mine would usually wake up and want to nurse right away and so even though they probably have to pee, I stopped bothering them with that. Also after they are done pooping at night I didn't take them at night because they were happier if I didn't try.