Essentially, you just need to remember that pixels are for monitors and dots are for physical products.
If you understand dpi, then you can easily make the jump to understanding pixels.
A printer prints in dots and a monitor displays pixels in a similar manner. 1 color per dot, 1 color per pixel. Pixels do not correlate to physical measurements (they can if you know your monitor's settings and your documents pixel per inch setting, but then you are going into a world of math that is outside of this post).
The best way to work, if you don't have a full comprehension of pixels and their relation to physical products, is to simply change the document settings in photoshop (or whatever image editor/pagination program you are using) to using inches as its base unit. Then you never have to even think about pixels.
Hope that helps.
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