No, Mercury cannot be seen in the night-time sky, because it is the planet closest to the sun, and it's maximum elongation is 28 degrees. Mercury is currently a morning star in the south-east, along with Mars and Jupiter.
Mercury is relatively easy to see, but you need to know approximately where to look after sunset or before sunrise, and have the patience and determination to either get up early enough, or wait until the sun gets beneath the horizon at sunset to be able to easily see it. If there is more than one planet above the horizon before sunrise or after sunset, some kind of guide to help you tell which planet is which is a good idea.