Reality shifting, a subject I'd like to see in a future anime series. Methods that work for others might not necessarily accomplish this great goal, but there are some commonly used practices to do so. People practice meditation and scripting usually. Visualization and setting your intention are important.
Think about all the details of your DR, from its general environment down to individual interactions. Write these details all out if it helps concentrate your mind (and then do some writing too). Last but not least, patience. DR shifting is not a race but rather the long haul. Persist in practicing--and don't become discouraged when you!! Have a return plan and be safe always