Mind the Overlaps
Always refer to the installation guide on the particular siding that you're installing, but most vinyl siding panels should overlap each other by at least an inch. Add 3/8 in. on hot days because the siding will contract when the temperature drops.
On the sides of the house, start each row at the back corner so you don't see the seams from the street. If the seams overlap away from the line of sight, they become nearly invisible. Lap them the other way and they'll be a real eyesore.
On the front and back of the house, overlap the seams so you don't see them from the areas where you spend the most time, like front doors, decks and patios. If the visibility of a seam doesn't matter at all, install the siding so the prevailing winds will blow over the seams, not into them.