How To "just Start"

Hey everyone, I had a question for all you entrepreneurs that I hope you can help me with. I hear a lot of people say to "just start" and figure things out as you go. And I totally get that mindset, but I'm having some difficulties with the beginning phase. I come up with some ideas, and start planning things, but when I get hung up on is the paperwork side. I start second guessing on what I need to get started. After I get the idea, and think of how to get the product going, should I be filing paperwork with the government before selling anything? Should I get a DBA just to get started, or get an LLC even though I don't know how big this thing will be. Do I get an EIN or wait on that for now? Do I get a business checking account, or just start selling something and if it gets bigger, get one later? Is it okay to get a website and email address without a DBA or LLC, and is it alright to sell things for now without those, and get them after I start?

I just get worried I may mess something up, and if something does relatively well, I want it to be sustainable and not be screwed up because I didn't do something correct in the beginning. How do people "just start" on this side of the entrepreneurship side? Do you all just get a website, sell some stuff, and then if it seems to have legs, do all the paperwork side then? Thanks for any help you can give. I would love to pursue some of these ideas, but it would be great to have some guidance to help me get over this mental hurdle.