Dave,
Yes, the length of the antenna wire is important. If you cut off 2 inches of the antenna it could possibly affect the performance of the radio. It's possible for it to still work with the wire removed, but it could have bad effects that aren't immediately apparent. It would be best to get the antenna wire back to it's original length. You can simply solder on 2 inches of wire of the same gauge as you cut off. If you're not comfortable soldering ask some of the members of your club and see if you can find somebody that will do it for you.

Hope this helps

Ken