Really interesting question and a key topic to debate.
I would have to disagree with
@allfoak only in so far that he states "no"! The rest of the post is bang on!
To illustrate why I think "no" cannot be the answer to the OP I'll start with the specific example of travel.
Liber Oz states that "man has the right to move as he will upon the surface of the earth"
It is glaringly obvious that we do not have that right. One only has to look at the jungle of Calais to see that a persons freedom is restricted. Hundreds of people who will to integrate into European society are restricted and prevented from doing so. One cannot argue that it is their will to be imprisoned there - many if not all would have exercised enormous will to have been able to leave their countries and migrate so far, only to become trapped indefinitely.
Liber Oz describes a world where a person might find theit will to be unimpinged by circumstances. But that world does not exist *yet*. These rights of man are not universally in effect! Far from it! So clearly circumstances are preventing people from attaining their will all over the globe.
That is why chapter 3 in Liber Al speaks so.much of war: the fight for Freedom for every man and woman. And this battle continues! Around the world so many stars are restricted every single day by their circumstancesite.
I believe that the True Will can definitely be restricted (though: the word of sin is restriction - Liber Al) we are not free in this world *yet* - do what though wilt *shall* be the whole of the law. We have come on leaps and bounds since 1904, but there is a great deal of work still to be done in this aeon. The crowned child has not yet conquered the world.
In terms of the magickal life, I think is it is crucial to carefully reflect and evaluate obstacles to the will.
Sometimes an obstacle is presented as a necessary challenge to be overcome, thus strengthening the person - the greater the trial, the greater the triumph.
However some obstacles may present themselves as indicators that what you think is in accordance with your true will, may in fact be the wrong path.
The mundane world can be all encompassing and full of persuasive notions. It's easy to let your magical life slip and get swayed by external forced into believing you will something that you don't. Persistent magical work prevents this, and if you find as a result of your work that a voice keeps on telling you that you should travel, then this should lead you to start removing any obstacles in your way. If it is your True Will then, even if really difficult, with focused magickal work you will achieve success.
However in my albeit limited experience, if the world keeps pushing back, if things are not only hard but circumstances seem to push you even further from your goal, then it suggests that reflection and mediation is needed.
Even if you firmly believe that a certain course of action is the correct one - the divine will knows better.
Thelemites should never presume that they naturally know the correct course of every action unless they are undergoing a constant practise that results in a perpetual reflection on their relationship to the constantly changing world.
To blindly think that one has attained ultimate control by surrendering to the belief that the Will will just manifest without effort or conscious action, and that by accepting thelema one must miraculously become free of all restrictions, is to neglect the core purpose of our sojourn through this life.
True Will is a verb not a noun.
I'm not sure if I've just non sensically rambled here!! Hope it makes some sense and provides some food for reflection!
In short- yes I do believe it is possible for Will to be restricted by external circumstances. Especially if these circumstances have been brought about by unwilled actions in the past.
Achieving your true will is not guaranteed!!
That's why they call it the Great WORK!