i'm going to re-side my garage with vinyl siding..i have bought the siding.and have a basic idea of how to install it..however..i have never done this before..i need to know how far i can overlap the pieces..and how do i determine how far above the lower piece do i intall the next row.. or in other words..how tight should i pull the upper piece after it's snapped into the bottom..or is there certain distance to intall each piece above the one under it..any and all help will be greatly appreicated..thanks..