You have to write the thing. You have to sit down at our computer and type your fingers along each key forming words into sentences. It sounds easy but it’s hard if you ‘ve been thinking about it for a while and you know you can do it, but time is running out. You’re already a day late and you don’t want to hand it in at the end of the day tomorrow. All you need to do it sit down and not get distracted. Drink some water. Sit up straight. Open a window. Check the fridge. Sit back down. Your anxiety grows to form a mountain range that now you have to climb over before you reach the spot where you can just sit down, and write the thing. Sit down, start writing.
Sometimes just writing about writing helps the worlds start flowing.