You can absolutely trust that by planting these subconscious seeds, thoughts will pop-up at you, often at random intervals. Just as you would by your bed, you need to record these thoughts throughout your day. Then, as Hill states, you need to act on them immediately.
As Dr. Joseph Murphy explains in, The Power of Your Subconscious Mind, “You avoid conflict between your conscious and subconscious in the sleepy state. Imagine the fulfillment of your desire over and over again prior to sleep. Sleep in peace and wake in joy.”