Replying to Progression from Cork 7 to double cork?

Hey guys,

Last season i went to "Folkehøyskole" in norway (Basically a gap year at a boarding school of sorts), were we skied a ton. I started really getting the hang of skiing in general, but most importantly park skiing! Around mid season i landed my first Cork 7, and got pretty used to throwing them of the bigger park jumps. On my last day of skiing for the season i landad a double backflip as well (best moment of my life).
Now... over to my question: how big is the leap from a normal cork to a double cork?
As i landed both a cork and a double back, it seems logical that i just have to put those together, and voila: double cork!

I think i might be underestimating how hard it is, and i dont want to get hust hahah, any thoughts on the matter would be greatly appreciated!