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This may be obvious, but never dumb yourself down at work, even if you're trying to be more likable. Part of upholding standards of intelligence and honesty for yourself is expecting that those around will you do the same. The best way to address a reputation for being "difficult"? By asking your coworkers what they think of you, and when they find you easiest to work with.
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From there, you'll realize something that's key to maintaining your working relationships: No one needs you to be "nice" all the time. But, they definitely need you to listen. It's no easy feat to strike a balance between being assertive and receptive, but it's what you need to do in order to succeed and avoid making too many enemies along the way.
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