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Personally, I would not hang a door without a 4 foot level. It's really important to make the hinge side plumb in both directions and dead straight. Once you've accomplished that, squaring up the rest of it is not hard. A brand-new door, should be really Square, so if you have any gap at all when checking it with a framing square, it needs to be adjusted .
You also need to check both your level and your framing square to make sure they are accurate. Most brand-new levels are not perfect and I've seen framing squares that are off as well.
And one last tip, when you're shimming the hinge side, make sure you have enough shims behind the door jamb that it can't move when you screw it down. You can put too much pressure on it, or too little, and take a perfectly straight jamb and put a bend or twist in it if you're not careful.
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