Mini Display to VGA, screen doesn't fit.  How do I fix?

When I use my Mini DisplayPort to VGA adapter, the resolution gets too big for my screen (mbpro 15") and the same thing appears on the projector I use. I'm not sure if I should change my screen resolution while I use the projector or what?
Also, the first (and only) time I used it, it seemed as if the signal wouldn't even send. After a while of fiddling around, the screen finally showed up on the projector (distorted) but we didn't do anything different to change that. It just kind of did it on it's own. Is this common for "first uses" or will this happen every time?
I plan on using this again Friday.

Probably the projector can't go to as high a resolution as the MBP's screen, so everything gets dumbed down to the highest resolution supported by the projector. That's to be expected in mirror mode, meaning when the projector and the MBP are trying to run the same content through the screens.
In Displays Preferences there is a Detect Displays button that is useful for times when the Mac is having trouble recognizing an external display. You can also put a check mark in the box for "Show displays in menu bar" and then you will have a shortcut in your menu bar to the Detect Displays command.

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