What is the purpose of the call?

W   Hi Tom, I tried installing my new car stereo, but I guess I’m just not good with electronics. Do you think you can help me?
M    I’ve never installed a car stereo before. I’m not sure I’d be able to do it.
W   Oh. I figured since you were able to wire your home system, you could install a car stereo. Do you have any friends who can do it? I’m afraid a professional might be expensive.
M    Well, let me look at the directions first. I’ll stop by later this afternoon and try to do it, and if I can’t, you should have it done professionally. I don’t think it’s very expensive at all.