The advice or words of wisdom is simple, do whatever you think you want to do. I mean I had to really figure out if this is what I wanted to do and why. When that was settled, I did my research on programs and such but for me I talked with other academics from different disciplines. I needed to hear what it would be like emotionally and mentally and then think about how I would handle those ups and downs. Once, I had the basics of what I needed, and I knew what I could control, I put my best effort forth and then I felt content with results. This has been my mindset, to understand the coursework, to learn and adapt, and do my best. And once you’re in a program, they want you there, otherwise they wouldn’t have accepted you.
Identify your passion and reason(s) for wanting to become a graduate student. Write them down, type it up, post it large and visibly on your desk or wherever you do your work so that it remains a constant reminder of why you are doing what you are doing and will motivate you through the hard times that every graduate student has and does go through, so that you can always see the light at the end of the tunnel.
Although I think most prospective grad students have been told about the importance of picking a study/project that interests you, I think it's also really important to take some time to see how you interact with your supervisor and lab. These will be the people you work the closest with for the next several years, and help provide support to you in some of your toughest moments.
My first piece advice to prospective grad students would be to find a lab or an advisor that you mesh well with and are excited about working with. If you are on the same page and feel comfortable from the start, it makes all the difference. After that, trust yourself and your abilities! You are capable of more than you think.
Be patient with yourself. As a student your job is to learn, and by necessity, fail. Solving the problem and having the right answer isn't always the same thing.
My advice for prospective grad students is to reach out to people. When I was looking at the CDE program, I reached out to a couple of graduated students in different fields to talk about their experience in the program. This information was very valuable and helped me to make a confident choice. If you have any questions about the program or my experience please feel welcome to reach out.