Thats the main gist of it.
Let's break it down into what the potential kid said in the movie:

"Do not try and bend the spoon. That's impossible."

Trying to do the impossible in a dream is, psychologically, as difficult as trying to do the impossible in waking life. Especially if you are new to dream control. You have doubts. You have to gauge "well what is this going to be like? What if it resists? How much force do I have to use to do whatever it is I'm trying to do." All of these psychological links to waking world "real life" physics makes it all the much more difficult to do whatever feat you're trying to accomplish.

"Try, instead, to realize the truth. There is no spoon."

Realize that all of these factors are constructs of your mind. If you're trying to walk through a door, don't think "Well this is a dream, and I should be able to walk through the door easily." Instead think "That door isn't physically there. There is nothing to keep me from walking through it except for my own insecurity.

"Then, you realize it is not the spoon that bends. It merely yourself." <or whatever he said.

In this, you're realizing the more 'mind over matter' aspect of dreaming (and some would argue, in waking life) but you're doing so at a most fundamental level. You're no longer Trying to bend the spoon, you're simply Knowing the spoon will bend because there is nothing to resist it but your own way of thinking.
The hardest part is actually getting yourself to welcome the concept blindly, because any bit of doubt is bound to hold you back in some way.