"Ah, poor James!" she said. "God knows we done all we could, as poor as we are—we wouldn't see him want anything while he was in it."
Nannie had leaned her head against the sofa-pillow and seemed about to fall asleep.
"There's poor Nannie," said Eliza, looking at her, "she's wore out. All the work we had, she and me, getting in the woman to wash him and then laying him out and then the coffin and then arranging about the Mass in the chapel. Only for Father O'Rourke I don't know what we'd have done at all. It was him brought us all them flowers and them two candlesticks out of the chapel and wrote out the notice for the Freeman's General and took charge of all the papers for the cemetery and poor James's insurance." (James Joyce, Dubliners)
What has ‘would’ been put in the clause for? When I back-shift the sentence, “I didn't know what we'd do at all”, it’s not likely what the context says. Is the original a present perfect, and ‘would’ is weakening the meaning of ‘don’t know’? (or does 'only for' mean 'without'?)