@amy1313 we follow wake windows roughly, we get out and about a lot so not always perfect but I need to get out and do activities to keep sane haha!
personally we wouldn't be able to stick to dead set times as wake times and naps do still vary and I'm not sure our lifestyle would suit being that rigid.
To sleep train we did a bedtime routine, bath, feed, sleep sack, book (not in the bedroom)
took in the room with white noise, sang a song and cuddled in arms for a few moments, give dummy. Lay down and say a sleepy phrase , we say 'sleep time, mummy and daddy love you'
stroke his nose a few times and leave.
then we left to soothe, if he cried , we went in after 2 minutes and said 'shh , your ok, we love you, time to sleep' and stroked his nose. No longer then 30 seconds and left.
repeated this and we didn't feel comfortable increasing the length of time so stuck around 2 minutes , 3 max.
same for naps with bath and book (feeds also in waking so no bottle)
if he was ever upset for two long, we picked up, cuddled for a few minutes and placed back down.