Isn't the point of The Dark Side of The Force that it's "easy" power?

Easy as in it's not as hard to get a hold of plenty of it, yet it corrupts the hell out of you.

Then why is Kylo Ren having such a hard time with it?

In the entire series we've seen characters slip to the Dark Side by accident...Luke at the end of Return of The Jedi...Leia during the same film apparently tapped into the Dark Side to kill Jabba...and lets not forget the single most famous force user to fall to the Dark Side...Anakin Skywalker.

Yet...even though Ren IS a Skywalker...or at least has Skywalker blood...AND the fact that he's trying his absolute best to be as evil as he can, he doesn't seem to have made much progress.

I would go on to make a point about Rey having such an easy time with The Light Side, even though Jedi require more training and discipline to master their talents...but I feel like that point has been brought up and argued enough, with a fairly reasonable conclusion.

Still...there are plenty of "other" Jedi who've fallen to The Dark side as well...during the age of The Old Republic, Jedi defected to The Sith in DROVES...they weren't brainwashed or anything...then again, this simple fact could say a lot of things about the way the Jedi taught their students back then.