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My Merriam-Webster Dictionary, American Heritage Dictionary, and Encarta Dictionary say FIRSTHAND, without any consideration for FIRST-HAND. However, a few websites (including the much-respected Oxford Dictionary) acknowledges FIRST-HAND to be correct.

May I please know your verdict? Thank you.
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Both are acceptable, daddyjohn.

Just make your choice and stick with it.

In English, consistency in speech and writing is prized over whether or not you use a hyphen.

I will tell you, however, that most hyphenated words eventually become one whole word.

Hope this helps;

John
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Thank you so much, JohnParis.