When we did w2s, I did it for every nap for 2 weeks. I had success about 50% of the time, the other bits, she woke up completely and I could not get her back to sleep. I found that it was a bit tricky to figure out how much to stir her. I could see her jolt at the transition, so I tried to intervene right before that by "holding" her in the crib (putting my hands on her) and then doing shh/pat if she continued to stir. It did work, but it took a bit for me to figure out what worked best for her. Good luck!!