preferably yes. there is a special tool which has a screw driver handle and pushes the spring down and a magnet built into tool grabs the collets, slowly release the spring up. There are others, but this is a simplest one, the springs have a lot of energy behind of them so spend the money and buy a legitimate tool.
if head has been removed you don't need the tool.
The tool is pretty much when you want to remove it from the motor without taking out the head. There was a Youtube on how to remove the valve springs from a honda, do a search and you should find it
I was in a similar position but with a Toyota 4AGE head removed from the bottom end. My engine builder used the above custom made tool and G-clamp to get the springs/collets/retainers out.
Pretty much mounted the G clamp up to the valve spring with the tool in place, tightened the G-clamp to compress the spring and the opening was there to pull out the collet ect.
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