replacing valve seals on a 318 procedure?

replacing valve seals on a 318 does this involve taking the heads of?

I've never done it before, as it seems straightforward I'm just curious if by using the piston to push the valve against when removing and replacing the valve spring I might bend the valve stem or damage the valve itself or the seating...

What's the 'procedure' for replacing the valve seals, tried and true?
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