Back to getting laid. The deck, that is.
I started by carefully pinning the boards down with just two nails each,
then in the next shot you can see I screwed them in with deck screws. I predrilled the holes before I drove the screws home. I took care to space them as evenly and carefully as I could, by the width of the fence of the speedsquare you see here, about an eighth of an inch. It was convenient to slide it along the length of the board to make sure the gap was consistent when I put the second and subsequent screws in.
I'd hand selected all the boards, but some of them weren't completely straight, like this one. I noticed it when I spaced the one end and then noticed the other end was not spaced the same. I resorted to moderate force to bend some of the boards into submission with prybars and progressive fastening.