Neville Goddard is sort of a 20th century pioneer in LOA and powers of subconcious. Although his studies are vast and there are many books and in-depth audios, i find this mini-clip about Imagination the best there is. Because, if u listen to it, u'll figure that he sums it up in simple terms and helps you on 'acting as-if' with 2-3 examples.
Very inspiring audio-clip. Sharing it and hope you guys get pumped up!