How much should I edit?

The more you leave out...

“Editing is like gardening, prune the branches, then the leaves.” I don’t remember who said it but it’s good advice. Think topiary.

Prune out the boring bits, the curly bits that go nowhere, the lovely words which don’t relate to the plot but sound wonderful. Copy and paste them into another file and find somewhere else to use them.

Ensure repetition is a rhetorical device for emphasis rather than redundancy.

Prune away the fluff and fuzz, anything which stands between the reader and your story.