I used a length of thin rope fed through the spark plug hole and then hand cranked to TDC. the rope then fills the combustion chamber & holds the valves up while you remove the springs to get to the seals. do 1 cyl at a time & follow the firing order.
you'll need a valvespring compressor tool and I suggest also a magnet to aid in removing the keepers. the valveseals themselves can be pulled off using some pliers and a suitable sized deep socket works perfectly to drive the new ones on.
it took me a full weekend to do mine, but it was the first time I ever really worked on an engine before.
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