The key is to do as many of them as possible and to keep at it.
The larger size is ideal to keep at home, while the smaller sizes slip easily into a purse or desk drawer.
However, if modeling is something you are passionate about, keep at it until you make it.
Set realistic goals like a pound a week so you keep at it.
No matter how many beds you plan, keep at least three feet of space between them for easy maneuvering, and be sure to locate them in full sun.