Are quadcopters difficult to fly?
Not really – the technology in most quadcopters today is very powerful and makes the flying experience fairly smooth and intuitive. However, it does take some practice to really learn how to maneuver with precision. You want to make sure that you do this initial learning phase indoors and that you be very cautious on your initial flights! Also, if your model includes a protective hull (usually a Styrofoam case that shields the rotors) make sure you use that while indoors and even on your first few outdoors flights.
Since quadcopters have to be light in order to achieve lift, they are very fragile and can be damaged from crashes into walls or other objects. If this happens, check the quad thoroughly before attempting to fly it again – and it may be prudent to purchase an extra set of rotors, or other replacement parts, in advance. That way, if an issue comes up you aren’t grounded for a week or so until the new parts show up.