Originally, the passenger side leak was not too bad. It was just smoking and stinky and I saw a small leak that was burning oil and causing smoke. Didn't think about tightening the screws, just replaced that side and it wasn't too bad. Just some wire harness needed moving.
However, the driver's side gasket is leaking real bad. My son is in college and called me yesterday because it was smoking so bad. So I made him drive home so I could look at it (same city, so not far). It is definitely the driver's side valve cover gasket leaking and it is bad. You can see oil under the vehicle and if you didn't look at the valve cover you could mistake it for an oil pan leak.
I'm going to drive over to his house this afternoon and try to tighten the screws a little and see if that works but judging from what the gasket looked like on the other side, hard and cracked, I'm not optimistic. I still think I'll have to replace the gasket or have it replaced. Still hoping for some input on the difficulty of doing that.
To answer dawgn86's question, in my limited experience, I would say that if it is burning oil and smoking then its probably still the valve cover gasket leaking because if its a bad leak, what doesn't burn will run down and look like its coming from possible the oil pan. That's what my son's vehicle is doing. If its not smoking, because ours is smoking bad, then its probably not the valve cover gasket. That's only my humble non-expert opinion.