Been a while but
from memory the tool (a bar similar to a pinch bar but with a wider mouth) was pushed through the spring and engaged the valve guide bushing which was then levered downwards slightly as Grant mentions, then removing the retainer at the top. When this is out, the lever is used to gently lever the assembly out of the block where another tool is used to compress the spring and remove the collets holding the valve retainer at the bottom. The guides are in two pieces.
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