I'm a serious amateur intermediate magician. I already did some shows and close-up.
From my experience, I must say that all that Mark Leveridge wrote, is true. He thought about all the details and gives practical advice.
I recommend this booklet at least to all the hobbyist magicians, but I think it can also be useful to some professional magicians.
I think that even you are a hobbyist, you must put on your magic as a professional, and for that, this booklet will help you. I'm sure of that.