What is the meaning of 摸着石头过河 I have: 哪里呀，我也是没办法，摸着石头过河罢了！

Is 摸着石头过河 'tapping in the dark'?

No, I don't know how, I'm still tapping in the dark.
I don't know about the phrase "tapping in the dark" because my limited English.

But 摸着石头过河 basically means try to do something via trials and errors. So my translation would be:

No, I have no idea, I'm still learning while doing it/I'm just trying to do what I can.