Vedic astrology is a complex science that offers insights into one's life based on the placement of celestial bodies in specific houses of the horoscope. The position of Mercury in the 6th House for those with Gemini as their lagna, is a unique placement that requires careful study to derive accurate predictions. Mercury being in an enemy sign state indicates that it may not express its full potential in this house. However, since it's still the lord of the first and fourth houses, it inherently has some strength.