You will need to remove the rockers to get the camshaft out. Pulling out the rocker shafts is the hard bit (depending on how tight they are). You will need to screw a 6mm bolt into the end of each shaft so you can get some grips on the bolt head and pull the shaft out. Once you've got the rockers out the camshaft should pull out.

Or you can make a puller like Kev did here...



Just a note: If you've removed the rockers, you can actually see the decompression pin and check that it's working without actually pulling the camshaft.

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