Thanks to YouTube and a LOT of googling I figured out how to make a START on my mashup. "Wonderwall" by Oasis x "18" by 1D were deceptively challenging to mix, if I'm honest.
I thought it would be easy because they both fit in the same key and Ableton could put them at the same tempo.....BUT the timings still didn't reallllyyyy line up.... I got there in the end with HEAPS of editing but have only managed to do about 30% of the project.
Hopefully I'll keep this up and get it ready by Friday for the big presentation.