I've slowly been using it with our second bit she is better at putting herself to sleep than my first. Basically if she isn't crying then I leave her alone even if she's awake. And I usually wait a few min. To see of she'll self sooth before going in to comfort her. I'd also not pick them up unless they were completely upset. They eventually learn that just having mom near is comforting.
We did the ferber method with my first and it worked really well for us. If I remember correctly the first few days were rough but after that it got better. I liked how the ferber method still had you comfort your child after a certain amount of time. It was most difficult for me in the middle of the night because she was sleeping still in our room when we did it. Its harder to let them try and self sooth when you are right there. When it was for naps I could walk away or lower the monitor sound. Plus I has timers set for each interval which helped me know how long it had actually been. Which is harder to do at night when their in the room with you.