1999 Toyota Avalon Valve cover gasket leaking

I need to replace the valve cover gasket because of oil seepage. The dealership wants $1200 to do the repair, but I have replaced the valve cover gasket on other models (4 cylinder Camry and pickup truck). Is this a difficult repair to accomplish? Any special tools required?

I had the dealership replace the timing belt. I did it on the old Camry, but it took a lot of time and it was worth the service special price in my mind, but $1200 for a valve cover gasket?

Please advise and thank you in advance

Pat