Do it mate
i started by accident like you 8 years ago,
hated my current job and thought sod it im going to end up in an early grave either through stress or i was going to get locked up for what i could of ended up doing to my then bosses!
the following day i went out with pad and paper knocking on doors,i couldnt beleive the amount of work i generated in just four hours,250 quids worth which i completed the nxt day!
From then on it snowballed,yeah i was lucky the area hadnt been covered and was ripe for picking,even in areas where there are a lot of windowcleaners ther is always enough work to go round,just go,do the leg work,get you face known it doesnt take long.
You are never going to get well working for some one else,making moneys easy, theres no tricks, i found a big smile and a positive attitude move mountains mate,a few carefully placed twigs and the fire will roar in no time.
go for it mate!
good luck Scott