muddle along
To attempt to proceed or continue doing something despite being unprepared or lacking the required skills, organization, resources, etc. I forgot my notes for the presentation, so I just had to muddle along off the top of my head. The company fell into disarray after the CEO was arrested, but we've been muddling along ever since.
muddle along
to progress in confusion; to continue awkwardly. I will just have to muddle along as best I can until things get straightened out. The project muddled along until the new manager got hold of it.