Erasing and Beginning

The thing is to become a master and in your old age to acquire the courage to do what children did when they knew nothing.  

- Arthur Miller

Choose a subject you know a lot about. Scroll your mind back to initial experiences learning and gaining more knowledge in this area of expertise. Close your eyes, click a switch and erase all memories and knowledge. Forget everything you know.

Begin fresh. Write from a child's perspective. Use simple sentences and baby words. Creep, crawl and rise to walk.  Then get your writing engine running.  Notice how words build upon words and memories enter.  Set them aside and design new ones.

Suggestions:

Write about the first experience playing a sport. 
Write about the first secret you shared and its magic.
Write about a first feeling of falling in love without reference to what you know now.

Keep deleting prior knowledge in your search for the pure form of your experience.