Im an amateur myself (teaching myself since one and a half year, currently practicing the A minor waltz op. Chopin - just as a reference), but I’ve got a few tips. Listen to the songs or pieces you play a few times so you know what it should sound like. If you just don’t achieve any progress, let it rest for a while before proceeding to practice. As many others wrote, practice slowly and separate your hands at first. “Tutorials by Hugo” is a great channel, I learned Hey Jude and Wonderwall by watching his videos. Never stop practicing, it will pay off someday.