5 Things You Should Never Do in Your First 90 Days at Work (and How to Avoid Them)

One of the most chaotic workplace dramas we have seen in a movie is ‘The Devil Wears Prada’. Imagine starting a new job and immediately being bombarded with a mountain of tasks, unrealistic deadlines, and a demanding boss and not knowing how to handle it. That’s exactly what happens to the main character, Andrea, as she begins her first day at a high-fashion magazine.

While your first day (hopefully) won’t look like Andrea’s, navigating a new workplace can still be overwhelming, the first 90 days are your chance to prove yourself and build a strong foundation, but it is also a period where common missteps can hold you back.

Here are five things to avoid in your first 90 days at work and how to ensure your story has a much happier beginning than Andrea’s chaotic start.

1. Going in Without a Plan

The Mistake: Jumping into your role with no clear understanding of what is expected of you can lead to missed opportunities and misunderstandings.

How to Avoid It: In your first week, clarify expectations with your manager. Set SMART goals (Specific, Measurable, Achievable, Relevant, Time-bound) for your first three months, so you have a roadmap for success.

2. Trying to Prove Everything at Once

The Mistake: Overpromising, taking on too much, or trying to impress everyone can quickly lead to burnout or, worse, unmet expectations.

How to Avoid It: Focus on doing a few things exceptionally well rather than spreading yourself too thin. Consistency, not flashiness, is what builds trust and credibility.

3. Neglecting to Understand Office Culture

The Mistake: Ignoring your new workplace's unspoken rules and norms can make you seem out of sync with the team.

How to Avoid It: Spend your early days observing how things work, including meeting etiquette, communication styles, and team dynamics. Ask a trusted colleague or manager for insights on what is valued and what is not.

4. Avoiding Questions to “Look Smart”

The Mistake: Thinking you must know everything from Day One and avoiding questions can lead to costly mistakes.

How to Avoid It: Asking questions shows initiative and a willingness to learn. No one expects you to know it immediately, so take advantage of this learning phase.

5. Failing to Build Relationships

The Mistake: Staying in your corner, focusing only on your tasks, and neglecting to connect with colleagues can isolate you.

How to Avoid It: Take time to introduce yourself, schedule one-on-one chats, and join team activities. Building strong relationships is just as important as delivering great work.

Avoiding these common mistakes can help you transition smoothly, make a great first impression, and set the foundation for long-term success.?

To help you navigate these critical early days, explore our course "First 90 Days in the Office". Learn how to master workplace culture, communicate effectively, and stay organised as you lay the groundwork for a successful career.

Click here to start your journey today!