I understand you have a Fret zero, right after the nut, am I right? And sometimes, you have a spot at the first fret, it's no big deal, the rest is the same.

As for tabs, you have to play them the other way, since you're a lefty, and don't forget, the line at the bottom is your biggest/lowest string.

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-3------------that's a G power chord. Play it and then mute the strings with your palm, you're on your way to metal heaven...