How do I do it ?

Hi…I cannot disclose the reason why I am asking all this but what I can disclose is that I am a non techie…well…we operate in extreme climatic conditions…so I have got this assignment wherein I have to heat up the trigger finger using a wire…and this wire has to be inside gloves that we normally use…and connected to an electricity source generating through batteries…and yeah once this system works, it shouldn’t over-heat as well…now how am I supposed to make it happen ?? please help me out…its too urgent !