I had a friend help guide it back on, but it can be easily done without scratching it. And even if you do scratch the top/rear of the cover it won't be seen once the windscreen cowl is back on.
To remove the rocker cover:
1. Remove the windscreen cowl as Chris say's, this is just held in with clips so just pop it off. Before you pull it away from the car, disconnect the washer jet hose on the right hand side of the car.
2. Remove the metal heatshield that is hidden by the windscreen cowel. You'll need a 10mm and 12mm socket with an extension bar. There are 3 bolts on each side. And one at the far back in the middle (where the extension bar comes in handy). Have a set of pliers for the front bolts that have rubber threads at the bottom.
3. Next remove the 4 bolts for the spark cover, then remove the coil packs and push the leads away and behind the cover.
4. Undo the bolts that are holding the pipe and it's bracket to the left. Then undo the bolts holding the bracket to the right. Squeeze the clamp holding the rubber hose onto the cover and pull the hose away.
5. By the serpentine/aux belt there are two little bolts holding a pipe that goes over the rocker. Remove these bolts (a little coolant will come out but don't worry). These need to be removed as it get's in the way of the cover.
6. Undo the 6 bolts holding the cover down. And pull it away. Simple! I will say, that when putting the rocker back on, don't tighten the rocker nuts too tight. The studs are made of chalk and snap easily, I found out the hard way :P.
Recently i've painted the rocker cover again, painted the spark cover. And painted the inlet manifold, engine mount and some other parts to freshen the bay up as it was all dirty and horrible
These pictures are a work in progress, and have done more than is in this photo. Just haven't had time to go take another yet.
Next up is new bolts and hoses, and more cleaning up in the bay!