Revise by yourself then ask someone else to revise the writing. It would be good to have someone with a different thought process than you. That person will normally spot out other things in the writing you might have not noticed.
Don't be afraid to make big changes in the writing! If you do not like a paragraph and wish to delete then it's ok, you can also rewrite the paragraph as you see fit or you can move it around to a different place in the writing. You can also do that before making small changes like grammar, spelling, and formatting.
