Hi Sarah,
Welcome to the boards. Hope you don't mind I changed the colour of your post to purple as the pink didn't show up very well. Also, I moved it over to the EASY forum so you could get responses and have a look through other routines in this section.
I would for sure start the DF now if you feel ready. One NW and feed is great already, way to go. We started at 4 months so no time is too late. We started 4 hr EASY at 4.5 months but every child is different.
HTH for now,
Aisling x