Certainly agree with Guppy.
Just like to add my 2 cents worth, as I did 10 years of it but a long time ago.
In civil aviation, the only legal low flying will be aerial work.
One of the biggest dangers of low flying are power and telephone cables. Most cable strikes are on occasions when the pilot was "aware they were there".
Before embarking on any low flying cable deflectors and cutters need to be fitted to your aircraft. One should endeavour to enter a field with wings level and also pull up and out of a field wings level. When clear begin the turn. If a cable is struck (normally the one that is forgotten about) the pilot has a chance of survival if the aircraft is latterly level, as the propeller, wire cutters and deflector hopefully will get you out of trouble. However if the wire is caught by the wing tip alone, during a turning pull up, you are dead, period. The wire needs to be cut or deflected. Aircraft wings are not known for their wire cutting properties.
Target fixation is another one to catch the unwary.