I've got a '95 LS Sedan.

I'm not a speaker/audio person, so this hasn't really bugged me, and I haven't had the money to get it looked at/fixed by a professional, but shortly after I got my car in '01, the front speakers started acting up, the pretty much died. I'll get either a little sound or some light hissing out of them, but that's it. Recently, though, the speaker on the passenger side has started coming back in, leading me to believe that I might have some loose wires...at least in that one.

My question: how do I check this? Are there directions somewhere I can look at, or is this a job for a professional?