| I can't help you much here Colin, I just use a suitable screwdriver to press down on the closer while slipping the feelers in and I haven't really had much difficulty (brute force and ignorance?). It does take a bit of force and pressing in the right place helps - as near to the closing shim as you can get.
I know how you feel doing it for the first time. I'd done 2V engines many times over the last 30 years but last winter was the first time I 'd done a 4V engine and I was a bit apprehensive. I was surprised how easy it was, just take your time, measure everything at least twice and write it all down. There's much more room in the cambox than there is in the 2V engines and once the cams are out (2 screws to remove each bearing block) there's loads of room for changing the shims.
Good to hear of someone else who's not frightened to delve in there. | 
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