My friend has come to me for advice with their CV. I'm happy to help - and would like to - but I'm conscious that I sometimes go overboard with advice that nobody asked for, or am overly critical without meaning to be. This is something I've been trying to improve both in and out of the workplace. I would be in the same situation if a colleague asked me to review a report they had written, for example.
They've asked me for general feedback ("Let me know if there's anything I've missed, or that isn't valuable", etc.) and I have identified some positives and negatives, but I'm struggling to know where to draw the line, and at what point I will have given "too much" feedback. My current approach is to pick one or two things which can be improved and focus on those (as well as pointing out the good things), without assessing every detail, but would like to know if there's anything else I can do, or another way of approaching it or realizing when to stop.
There are other questions about how to give demoralizing feedback, or how to feed back on a particular issue. I'd like answers which focus on when to stop giving feedback when it is requested in a general way.
How can I give meaningful feedback or constructive criticism without going overboard and tarnishing our relationship?
Edit: it's worth noting that I am not a hiring manager. We are both relatively new to the workplace after college, though I've been working for a few years. I enjoy reading up on CV/resume/general workplace issues regularly, review some CVs at work (though don't make final decisions on them) and have applied/interviewed for more jobs than my friends. So, I'm more educated than my friends on the subject and do feel I can give them useful feedback, but I am by no means an authority.