Should I get a friend or relative to proofread or edit my novel?
I would never get a relative to proofread or edit my work because I think they're likely to be too kind. You need someone quite ruthless. You must expect to be criticized and to take it in the spirit of the thing. Friends are good to read your books if they have some experience in reading and, well principally reading. If they are good readers they are likely to be able to help you. Sometimes their comments can be basic, "I don't like this character" or "I do like this character", but that's sometimes good.