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You've got the right idea. Typically, you won't see the needle move much during this adjustment. Firmly seat the float pivot pin into the bowl casting with your finger and hold it in place to anchor the float while checking and making adjustments. Adjust a T-ruler to the correct float level setting. With the float pivot seated in the bowl, use a ~6" screwdriver (it's about the right size and weight) to press down on the metal float plate directly above the needle valve to close the needle against its seat - DO NOT apply excessive pressure on the needle valve or you can damage the Viton tip. Place the T-ruler across the top of the bowl and adjust the float by gently bending the float arms, so the T-ruler just touches the tip of the float.