this is a method i use when i firt began using visualization to help with spells and energy ect.
simply write down what it is you wanf to visualize make sure you use discriptive words. When you are done read it out loud and try to visualize it while you are reading. This is similar to reading a book, remember the last time you have read a good book, you were not only reading it but you were probably visualizing it too. Simply put when one tries to visualize some people get caught up in what too visualize and which parts of the visualization are you putting in. This takes both the task to think anout what your visualizing and doing the visualizing itself, this method simply seperates the 2 task and allowing on after another to visualize
How to visualize easier