LibreOffice: Creating invoices using Writer

From the very start I have been using OpenOffice (now LibreOffice) for creating my own invoices. The first thing you have to decide is whether to create your invoice with Calc or with Writer. I decided to use Writer, as it is harder to create a proper layout with a spreadsheet document (especially when using window envelopes) that comes out well on different printers, but that's up to one's preference.