It is very important to design your print project with the finishing method in mind.
A spiral bound book needs a certain margin to enable the paper to be punched or drilled and for the spiral to be inserted into. The margin will depend on the number of pages and the size of the spiral. You will need to decide which edge the book is to be bound on before starting the design. Then you will need to check with the printer how much margin is required. It is normally at least 1” to 1.5” or 25mm to 40mm. This may vary depending on the project. If the margin is too small there is the possibility of text or graphics falling in the binding area.
It is much easier, and cheaper, to set the margins correctly initially rather than try and correct later in the process.