Hi,
I do a bit of grass and hedge cutting,its only about 15% of what I do.
Although it pays aswell as windows its a lot harder work,plus its a pain in the butt getting rid of all the cuttings.
Iv'e been slowly getting rid of this work and concentrating more on windows especially since using the pole.
There is quite a bit of expense involved,if you don't have decent mower,stimmer,hedge cutter they won't last very long.So if I were you I'd go for more windows rather than garden work.
Tim