[Hondaracer]

Snap lines on the joists as guides, if you slightly miss the hoist it could cause squeaks in the future. Although with another layer of 5/8 on top you’d probably never hear them.

If you hve some minor dips afterward I’d also recommend doing some self leveler. the Mapei Novaplan 2 plus is pretty user friendly even for a beginner and it works very well.

Floors are like painting cars, or anything really, if you have any doubts about a low or high point it’s best to address it in the sub floor than try to do somthing after the fact when laying the floor