"While he would dance round and hinder them." Here "hinder" means

You never saw such a commotion up and down a house, in all your life, as when my Uncle Podger undertook to do a job. A picture would have come home from the frame-maker’s, and be standing in the dining-room, waiting to be put up; and Aunt Podger would ask what was to be done with it, and Uncle Podger would say:

“Oh, you leave that to me. Don’t you, any of you, worry yourselves about that. I’ll do all that.”

And then he would take off his coat, and begin. He would send the girl out for sixpen’orth of nails, and then one of the boys after her to tell her what size to get; and, from that, he would gradually work down, and start the whole house.

And then he would lift up the picture, and drop it, and it would come out of the frame, and he would try to save the glass, and cut himself; and then he would spring round the room, looking for his handkerchief. He could not find his handkerchief, because it was in the pocket of the coat he had taken off, and he did not know where he had put the coat, and all the house had to leave off looking for his tools, and start looking for his coat; while he would dance round and hinder them.

“Doesn’t anybody in the whole house know where my coat is? I never came across such a set in all my life—upon my word I didn’t. Six of you!—and you can’t find a coat that I put down not five minutes ago! Well, of all the—”

Then he’d get up, and find that he had been sitting on it.