Setting the scene around your characters is always an important step in creating a story that comes alive for your readers. However, sometimes—especially during the beginning phases of your writing, the most important thing is to keep your imagination flowing steadily from one thing to the next. Often this means temporarily skipping over the details and coming back to them later.
One trick for these situations is to write out the dialogue between your characters first. Especially for pivotal scenes between your characters, making yourself interrupt the dialogue just to set the scene could end up disrupting the flow of the conversation. Therefore, it is easier to write out the dialogue in full, and then go back and add setting / actions later.