I am an amateur web designer and developer. How can I prepare myself for an entry level product management interview and role?

Plenty of UX pros enter into product management. What they are able to do well in an interview is translate their UX insight into solutions that address core customer needs and have a plan for how to go about implementing those solutions. First, make sure you understand the business relative to its industry. Understand what the business is trying to accomplish with its products. Get a feel for the type of customer the business serves. You should make note of EACH of the job responsibilities for the new position and be able to answer the following 2 questions: Basic 1) What is the core business responsibility? 2) How would I address that need with my skills and insight? And what example can I provide? The following questions are for more of an open-ended interview where the interviewer wants to see how you think: Advanced 1) What problems are implied based on the business need? And how would I solve them better than the next person? 2) What opportunities do I see with the business and or industry? How would I go about pursuing those opportunities? In your responses state the problem, the solution, and how you achieve the solution. This might over-prepare you for an entry-level interview but it will certainly make you an excellent, memorable candidate.

I agree with the points made in the other 2 answers provided so far but I see things from a different vantage point many times when it comes to Product Management  It is my firm belief that to be an effective PM, you must live, love, eat, feel, breathe, sleep, and coddle this product. It is your child and You are responsible for knowing every aspect if strongerI started out at the bottom doing support in one of the products I later was granted. Then later I was a salesperson, systems engineer, assisted with marketing and tech writing. Now, I'm sure that's not the path most people want to take nor is it typical. However, the knowledge of the industry as well as the inherent tribal knowledge of my product allowed me to push it to heights it had never seen before. I was able to empathize with customers and Support team (who can be your strongest ally or your worst enemy). Embracing the user experience is what we are all about but if you haven't been through the experience itself, the context with which you make every decision will be skewed. Take time to get on the front lines and "become the user." Learn their true frustrations and not what you assume they are. No lie - as a payments lifer, no one wants to go in public with me. I pick up payment terminals, complain loudly about poor transaction flow, get giddy when I get to use something I've worked on, or start asking merchants what POS they're using and why. Every chance I get to talk to a real world payment user, I use it to gain first hand insight. I've jumped on my soapbox because I'm passionate about Product Management and Payments. I hope I've given you some practical wisdom you can use.