Wiktionary
muddle through
vb. To succeed (often clumsily) despite being ill-equipped or inadequately trained.
Usage examples of "muddle through".
He even ran away with hunself and became a farsoonerite, saying he would far sooner muddle through the hash of lentils in Europe than meddle with Irrland's split little pea.
They say we Brits muddle through things, but we're bloody Prussians compared to this lot.
I've had my moments, but mostly I muddle through by shoving a lot of energy into my spells until it doesn't matter if half of it is slopping out.
Although it was his gut feeling, doubtless illogical and indefensible, that the sheer cussedness of his own species, despite its record of atrocity, would ultimately allow it to muddle through.