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To get 220V you'll need two separate phases of 120V current. You could try an AC volt meter to see if any of your 3 breakers are on the same phase or not. If on the same phase, you'll get essentially 0V between the hot leads of each breaker. If any are separate, you'll see 220V between the leads. If those 3 breakes are all on the same phase (likely if they are connected to the same feed wire), you'll need to go back to the main panel to get the 2nd phase.
And yes, would be a good idea to get professional help if you don't know what you are doing.
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