The more you use your brace and bit in different situations, and at different angles, the better you will get at boring straight by eye. Until you get there, here are a couple of aids you can use that will help you along as you practice.
On today’s show, I discuss finishing both sides of a board, book matching veneer, cooper’s jointer planes, workbench designs, pins vs. tails, hand tool jigs, boring straight with a brace and bit, and experimenting with historical practices in your shop.