Wallace Wattles, another bestselling author (in his book The Science of Getting Rich), talks about a man who had a modest house and visualised an anthracite stove to keep him warm.
Once the focus of his attention and visualisation was achieved, he then expanded upon it. Adding new wings to his house.
Again, small steps were taken first.
A wonderful friend of mine, and New Thought Scholar, coach, speaker and author, also talks about the importance of setting goals that you can achieve easily (i.e. they are inside your Sphere) so that you Get Results Fast.
When you see things working, you get the experience of your manifesting working for you. And you can then expand upon them.