If at all possible, do your work only at work/only during work hours. Give yourself permission to have boundaries at work. Just because you’re at work doesn’t mean you can’t set limits. Holding back about what you need will create resentment toward your coworkers and employer. Don’t let issues go too far before you decide to set boundaries. Start setting them right at the onset of possible issues. Teach others how to respect your boundaries by being consistent with respecting them yourself. If you choose to declare your expectations, be clear and up front.