How much would it cost to get a new valve cover gasket put in?

My car is leaking oil from the valve cover and it's burning on the exhaust. It smells really bad so I wanna get it fixed. I bought the new gasket about a year ago, but I don't have the time, or know how to put it in. How much can I expect to pay to have someone put the gasket in for me? Also how long of a job is it? I can't go that long without my car. It's a 2002 Ford Focus ZTS with 150000 miles on it.

If you can hold a wrench (or socket wrench) you can change the valve cover gasket. It's just a matter of removing the bolts (or nuts) that hold it on. After you remove it clean both surfaces and install with the new gasket. It should take you about 30 minutes.

So - they'll replace the valve cover gasket when they replace the head gasket you said you needed yesterday.

Installing a valve cover gasket isn't hard if you have the tools. A mechanic could do it in less than an hour.