Roas, I'm sure you figured it out already but if not here's how to remove them using Steve's annotated figure.
To change a pair of oil tubes (in blue), loosen and remove the camshaft brackets so as to slip the 'tits' (red arrows) on the oil tubes under the camshaft brackets. Do ONE-PAIR-AT-A-TIME since the camshafts are under tension. Then replace the bracket and tighten before moving on to the next pair. That's the way I did it.
Parts:
1) Buy a valve cover kit because you will want to change the gasket and the spark plug seals.
2) Will probably need a 'breather' tube assy. Mine was like the petrified forest!!
3) Will probably need the chain tensioner clamp. If it is as brittle as mine was, it will break when trying to remove it.
That should do it.