How can I successfully refinish my worn coffee table as a complete DIY beginner, with tips and step-by-step guidance for this nerve-wracking project?

I’ve decided to take on the challenge of revamping our coffee table as my very first furniture DIY project! After surviving three kids and multiple moves, it’s definitely been through a lot, but it’s still in good shape overall. My plan is to change up the finish to a darker shade and give the top a nice smooth finish while fixing up any dings and imperfections. I’m feeling a bit nervous about the whole thing and honestly have no idea where to begin. Any advice or tips would be greatly appreciated! Bonus points if you can provide a step-by-step guide for a total newbie like me 😂.