For oil filter removal consider (not a cheapie sheet metal one) but a quality casted metal oil filter end wrench, size 65mm, 14 flute. This size fits the stock Nissan filter and most all the brand filters you would be apt to use on your Z. You could also go with just a decent strap type oil filter removal wrench. Don't ever get the bright idea of driving a screwdriver through the oil filter in an attempt to remove an oil filter. Also, always be 100% sure when you remove the old filter that the rubber gasket is on the old filter once you got the old filter off.
Hey... about your first oil change. Ahhhhh, every guy I know to include myself had fun lets say doing their first oil change. Fortunate guys were the ones that had a Dad or friend that was oil change savvy to be there when they did their first one. Next time will be easier. Also, no, you did no damage other then the scratch. Just don't do that again. 8-)
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