Use 'muddle through' to express that someone isn't fluent but still manages.

Not Fluent

'Muddle through' often hints at improvised or temporary solutions in tough situations.

Ad-hoc Solutions

'Muddle through' implies managing a task without having expertise in that area.

'Muddle through' speaks to proceeding despite confusion or unpredictability.

It suggests continuing without a clear plan or detailed strategy.

Using 'muddle through' implies success was not guaranteed and was somewhat unexpected.