However, the editor will make comments in your manuscript if your work is missing vital information, if we feel the subject matter needs to be shifted, or if we have questions about the people, places, or events. You will receive the comments after the first round of editing is completed.
Basic copy edit includes grammar, punctuation, consistency and word usage.
Line and copy edit includes the above plus syntax, clarity of expression, sentence restructuring for consistent flow.
Comprehensive edit includes the above plus content removal with proper replacement, verification of facts, line-by-line commentary review & critique for concept consistency, organization, flow, cohesiveness, intended use and marketability.
If self-publishing, yes, you can use your own editor.