The analyses of a text #3

The narrator recalls his adolescence.
He stopped by the local undertaker Mr. Omer's place before visiting his old nurse Peggotty's house for her husband Mr. Barkis' impending death.
Now Mr. Omer, who suffers badly from asthma, is telling him the distress that he can't ask after the very sick acquaintance due to his job's characteristic.

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'It's one of the things that cut the trade off from attentions they could often wish to show,' said Mr. Omer. 'Take myself. If I have known Barkis a year, to move to as he went by, I have known him forty years. But I can't go and say, "how is he?"'
I felt it was rather hard on Mr. Omer, and I told him so.
'I'm not more self-interested, I hope, than another man,' said Mr. Omer. 'Look at me! My wind may fail me at any moment, and it ain't likely that, to my own knowledge, I'd be self-interested under such circumstances. I say it ain't likely, in a man who knows his wind will go, when it DOES go, as if a pair of bellows was cut open; and that man a grandfather,' said Mr. Omer.
I said, 'Not at all.'
[David Copperfield by Charles Dickens]
1. I'd like to know what "take myself" means.
2. I'd like to know what "to move to as he wen by" means.
3. And I'd like to know if "that man a grandfather" means "that man of a grandfather."
Thank you in advance for your help.