I always thought H1 should be the title of the post.
Does the next structure make sense to you?

How to tame your pet (H1)

Introductory paragraph.

1. How to tame your cat (H2)

Paragraph one.

1.1 Pet your cat (H3)

Paragraph two.

1.2 Give Delicious Food (H3)

Paragraph three.

2. How to tame your dog (H2)

Paragraph four.

2.1 Pet Your Dog (H3)

Paragraph five.

2.2 Tell Is a Good Boy (H3)

Paragraph six.

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