You won't be contacting many people then.For me, I will look on google earth, make sure you look like a builder/electrician/plumber (van outside etc) before i contact you.
If you look at my house on Google Earth there are no vehicles outside the house, driveway is totally empty.
This is simply because when the Google car went past, I happened to be out working. Probably find that's the case for most other people as well.
In fact, if there was a van or whatever parked outside during the day, that could indicate they have no customers because they are rubbish and therefore not the sort you would want to be using anyway.
Or did you think that Google Earth is updated in real time?
Yellow pages and all that = colossal waste of money. Would be more effective to take 2k in £5 notes, write your details on them and throw them down the middle of your local shopping centre on a Saturday lunchtime.