Also, it's very simple and quick to sharpen your own chain(s). I
thought it would be difficult too but when I tried it (with a
Dremel
clone, plus attachment, not expensive) it was very quick and easy,
I
was pleasantly surprised.

Yes, it is an easy job; but don't forget to take off the chain and
smooth the burr off the bar regularly -- not cutting your fingers on
said nasty burr! Then, of course, take up the slack when refitting.

However you do it, sharpening your saw regularly is an important part of
using it safely. Just as with any cutting tool, using a blunt saw can be
dangerous, so learn to sharpen it yourself. Lots of advice on the web.