Unless there is an underlying premmie issue or something else I would use the old saying
'never wake a sleeping baby'

Congratulations, you will be just fine. You will be amazed how it all just falls into place.
I think now you go by your judgement with solids. So somewhere between 4-6mths. Have a look at the baby led solids thread as they follow the Gill Rapley principles of Baby led weaning. Which is no solids until 6mths and finger foods and no purees. Provided that works for you. Not sure what I plan on doing yet, will cross that path when I get to it.

x Heather