When learning new vocabulary, imagine the shape and sound of the desirable word and play with its image in your mind. (the visual word form area (VWFA) exists in both hemispheres of our brain); motions such as shrinking or stretching the word shape (letters) or splitting in half for an easier pronunciation. Pronouncing the word "instantaneously" is possible by cutting it in half or three smaller parts.
Many language learners avoid listening to native speakers under the pretext of being beginners; but authentic resources give a huge hand to develop a real English accent and writing style. A useful tip here: try not to understand all the words English people say! even in our mother tongues, we do not recognize all the words in a said sentence. We only take the necessary and comprehend them.