Before you start
Before you start, allow the mouldings to acclimatize for 24 to 48 hours in the room where they will be installed.
You can paint or stain your mouldings in advance. You'll simply need to touch them up a bit after, to cover the nail heads you've concealed with wood filler.
Use a good-quality finishing blade with a minimum of 40 teeth, though 80 teeth is preferable since the more teeth a blade has, the cleaner the cut.
Pre-drill your nail holes so the mouldings do not split. Use a drill bit of a smaller size than the nails.