How to not get distracted

So I really need to sort my room out! It's so messy (can't even see carpet! Because of layers of stuff!) So much of it can be binned as I don't use it (clothes ect) to make room for new stuff

Before anyone calls me a scruff I temporarily moved in February and just threw all of my stuff I didn't need to take into my room as it was a very last minute decision.

But I keep getting distracted by things and i really need to get it all done asap so I can put my Christmas decorations up on December 1st