Ways to Say “It’s Difficult” or “It’s Easy”

It is not so simple.It’s a difficult task.It’s not so easy.
It isn’t a walk in the park.It’s quite tough at times.It’s a very tough task.
It’s a bit tricky.The course is quite demanding.The course can be gruelling at times
It’s not a course for the faint-hearted.It’s nigh on impossible. (UK)It’s not the easiest ___ in the world.
It’s (quite / a bit) hard going.It’s very hard. 
It’s a snap.It’s a piece of cake.There’s nothing to it.
Anyone can do it. I can do it in my sleep.I can do this with my eyes closed
It’s easy as pie / easy as a,b,cI can do it with my eyes shut.I was born doing this.
It’s a doddle (UK)No problem is too big for me.Easy peasy.
I can have this done before most can finish getting ready for work.I eat “programming” for breakfast.  It’s a walk in the park.
It’s a breeze.It’s a cinch.It’s easy as 1 2 3
It’s not rocket science.This is easier than drinking water through a straw.It’s childsplay.  
This work is like a drop in the bucket for me.I can solve this without having to move.I can do this standing still.  
This work is as easy as catching leaves in a basket.I can do this with one hand tied behind my back.This is like playing paddy cake.  
It’s easy as the wind blows.I can do this in the dark.It’s like shooting fish in a barrel.