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Originally posted by colorado
best advice i can give is do not use booleans.you will do twice as much work to fix it after.its not worth it.youl be a better modeler for it.dont rely on shortcuts.
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Then what do I do?

you could try Polygon > combine > and then Edit Polygon > merge vertices ... depending on the complexity of what you are joining This could be the afore mentioned hours of work but it will get it done ...
however if any of the listed problems with performing the Bolean are present they may be worth cleaning up as they are bound to cause you similar problems later on when it gets harder to fix them
... thats what the monkey said