I have finally got my torque wrench (and gaskets) and am planning to replace my rocker cover gaskets as these are leaking oil both front and back. As I have never done this before I am planning on just doing the front one first to see how I go before having to remove the plenum chamber for the back one. My question is how hard is it to get the rocker cover off (as I know that the spark plug seals are probably going to make it not want to come off). How is the best way to get the seals off? Should the seals stay attached to the rocker cover or do you push them in as you are taking it off?
Yes I am going to also replace the back spark plugs while doing this.

Any advice about this job would be much appreciated.

Thanks

My rocker covers came off fairly easy just by pulling them. I think you can use a rubber mallet gently if they are stuck on.
I used a screwdriver and pliers to get the old gasket out but it is an annoying job and the gasket breaks up so you can't just pull it out.

Im thinking of going to the local wreckers and practicing on one of their wrecks

I did the front rocker cover gasket and tube seals 2 two weeks ago and am now doing the rear bank with the platinum plugs. Both rocker covers came off easily and the tube seals were all stuck to them. Was a pain to get the old gaskets out, used a small screwdriver too.
When preparing for this job I found this post very helpful: http://www.aussiemagna.com/forums/showthread.php?t=65188&page=2

My breather hose and the hose between both rocker covers were that brittle, they broke when attempting to remove them. Ordered new parts from Mitsubishi.
Also with the intake plenum removed, i noticed oil leaking from underneath the dizzy. So changed the dizzy O-ring as well. The old one snapped while removing it...

Since I only recently bought the car and those gaskets should have been changed a while ago, the engine was very dirty. I used the engine cleaner and rinse at the local car wash place to clean it up a bit before doing this job - made working on it a lot less messy.

A word of advice: On my Pajero, the "mechanics" who overhauled my engine used about 6 tubes of silatic on every conceivable joint and then some as well. I had to get the engine stripped by a real mechanic after thay had not done their job properly. The car had only done 12 km, and 3 of the 6 spark plug tubes had oil in them. Reason - the "mechanics' had used silastic on the main rocker cover gasket - lots of it - and the new spark plug gaskets were unable to compress properly - hence they leaked oil.

Mitsubishi in their infinite wisdom do not use silastic gasket material on the rocker covers and spark plug gaskets - I reommend that you do not either.

The workshop manual tells you what sealants to use and where. Ignore this at your own peril. lol