I did it with DS at 8 months and it worked very well.
Did you start with naps then tackle the night time battle?
No, the only thing I did differently was gradually night-weaned first, so it wasn't a shock not to get boob. (I progressively started to cuddle him back to sleep when he woke in the night, before I started PU/PD) But it is important to try to get your naps sorted into a good rhythm so your DD is not overtired.
How long did baby protest for?
The very first go I think the cry, pick up, put down, cry, pick up put down went on for about 40 minutes, then a bit less the next wake up.
How many days before they got the hang of it?
The second night it got better, the third night he slept longer than he ever had before, it took about 2 weeks until he was reliably sleeping through from about 8pm to about 5am. Not 2 weeks of crying, I mean 2 weeks until he didn't wake up at all. Before I did it, he was waking every 2 hours for bf. He had never slept longer than 4 hours in his entire life.
How did you stay strong and not give in to 'your old ways' of comforting? Because by this time I was desperate to get him to sleep as I was so sleep deprived, so I was determined to do it. I had the advantage of meeting someone at a baby group who had just done it and recommended it to me, so I was confident about it. I knew that if I gave in and put him on the boob, all the effort so far would be wasted.
You really need to read the book(s) and/or go on the baby whisperer forum, to get as much advice and support as you can, so you get it right the first time. The most important thing is to be consistent. And also to pay attention to her 'cues' so you know when she's tired, over-stimulated, etc. or genuinely distressed. Or crucially, when she's doing the monotonous, self-soothing cry which means she's trying to get to sleep, so you don't pick up, just be present and say your key words.
It was a long time ago, I don't remember it all.
As my sister said to me, if someone gave you £20 note every time you woke up in the night, you would keep waking up, right?
Good luck.