No, it is not presumptuous. A movie differs from the novel in that the movie must be primarily visual. A novel is guiding the audience's imagination, And novels depend much more heavily on exposition, description, and dialogue than a movie does.
Movies depend on music, images and sound. Listen carefully to the dialogue in a movie, you will notice is far, far more sparse than the dialogue in any novel. Movie directors count on imagery, acting expressions and body language and tones of voices, to carry the meaning of words. Just the word "No," correctly spoken with the right expression, can be more effective than several paragraphs of exposition in a novel, we can see the emotions, the tears or anger, the regret, the fear, or the love in that one second of film time.
To turn a novel into a movie, you must write a visual story, with action and emotions.
Also, you must understand a movie is a collaborative process. Unlike a novel, the author of a screenplay has little (or zero) control over the sets, the music, or even what the actors look like. Sometimes not even their gender!
The screenplay is akin to a blueprint for a builder; the author is the architect of the story, the builder is the director that will choose the details, atmosphere, music, etc, and may even revise the blueprint to suit their own tastes.
Understanding what goes into writing a movie script, one can write a novel with a movie in mind. But it is best to seriously study movie plot construction, expectations and norms if that is what you want. Many novels are not adaptable to movies. You need a similar structure.
Novels can support more sub-plots and stories within stories than a movie script can. A novel has much more space for side-trips, a movie does not, you get 110 pages, give or take a few, and that's it.
A great deal of sweat is expended on conciseness of both set descriptions, dialogue and emotional state description. You really have to learn to trust actors and directors and set builders to take sparse notes and still get it right. Word choice can be paramount here, to save space.