Is replacing the left hand top rocker gasket relatively straight forward, or do you need to drop the engine?

Mine's leaking (having been fixed once already this year by a dealer), and I want to try and sort it myself this time.

Rocket

 

I've done the lower-driver's side gasket, but not the upper. I have done a spark plug & wire change, and based on that I'd say it wouldn't be a big deal. Investing a few extra minutes in removing the HVAC plumbing is all it would take.

 

If you mean the cam covers, the engine does not need to be droped. I had mine done earlier this year and they did not charge me for an engine drop.
Tito.