Make copious notes, add lots of comments, and don't be afraid to refactor for readability/understandability. Write both comments and code like you're explaining

Make copious notes, add lots of comments, and don't be afraid to refactor for readability/understandability. Write both comments and code like you're explaining it to a third-grader. When each chunk is easy to understand, it'll be easier (or possible) to see how it all fits together. It's not YOUR brain that is deficient; it's the human brain in general. Code should be written around that fundamental constraint.