Get to know the people first. Understand why they are in this job, what their hopes and expectations are both in the day-to-day, and in the long-term for their career path.

Understand that all change is going to have a personal impact of each one of them. Knowing the above will help you know which people will be happy/angry over change, and you can work with them to help them understand the context of why changes are needed, and what the future holds.

And don't make change for its own sake. If you cannot justify how changes are better for the team, the company, the product... then you should not be making changes.