About 15 years ago, I started using a toenailing trick that makes it easy to start the nail without its slipping. I put the nailhead where I want to toenail, as shown in the drawing, and rap the point a couple of times with my hammer. This makes an angled flat where I can drive the nail at right angles to the wood surface. It also blunts the nail, which makes it less liable to split the wood.
Andrew Hamilton, Antioch, CA