I'll show you my method for cutting my own hair using scissors and some clippers for detail work. Save money and time!
Step 1: You will need...
a good pair of ambidextrous scissors (that can be used in either hand),
a small mirror,
an electric clipper,
one or two plastic garbage bags to catch the messy hair clippings, one for the counter, and one for the floor.
These should all cost you less than $30 U.S. ($10 Canadien), but these will pay for themselves after one or two haircuts, so go ahead and get a very good pair of barber's scissors.