I had a terrible time flashing my hardware for the first time. I tried doing it from my laptop as well. Over and over I failed. Then, I went and bought an Arduino UNO and compiled the Marlin Firmware on there. Fired up my printer and it worked right away. I’m a noob just like you lol. It all seemed so daunting at the time. Here I am, 3 months later, giving advice… who would believe it?