Will I ever go professional? Probably, but the idea of people telling me what to do bothers me a little. Anyway, I've been into other things lately, such as architecture design.
Two books I bought recently are Terence Conran's Essential Small Spaces and Essential Bathrooms. I like the bathroom guide better, because like it says, bathrooms are sanctuary inside a sanctuary. A place where we are shielded from the outside world's problem. The book is not intended exclusively for professionals I think, but rather for DIYers. Simple thoughts and design considerations can change your bathroom dramatically!! (OK I might be a little exaggerating)