"Easy" just comes with practice and technique (Most of that is a combination of timing and position) - a good lead should be able to lead moves that are "easy" to follow.
I found the elbow roll moves quite tricky to get, but can now do them with relative ease.
The first move (and basket) I found twisted me in a strange way due to the front hand still being connected while we were both stepping back almost away from each other. I find them easy now.
First move mambo walks and penguin walks and all those type moves I kept getting the timing wrong on. I've got that nicely now.
Archies and barrel rolls used to be quite difficult, but I've learned how to time it and position myself so that it's not any more.
Getting the follower to come out where I wanted them on a cattapult was tricky for a while, but I've got that now.
I do find some of those tango leg flick thingies quite hard to lead just now - I'm just not getting my timeing right and am looking to lead the follower's leg instead of leading the action that causes the leg to flick.
I find it quite hard to lead a low seducer - the position of my outside foot is slightly out, my knee is bent at a crooked angle, by balance feels wrong, I'm leaning over the follower too much... but I'm getting better.
I don't like arials, so I would probably find it hard to do them. Besides that, I rarely find moves "difficult" now {Although it's often a challenge getting my right and left hands the correct way round
}.