I started it about a month back, not gonna lie, at first it is a lot of effort for the money you get. BUT I love it! It's giving me time to get out and do something, we're out most days doing bits for it, so we're not stuck in the house and it's good exercise! I put a note on my books introducing myself and asking people to tick a box and add their house number if they're not interested! Means I lose less books and saves me time and people getting pissed off with constantly getting them thru the door!
I avoid door knocking at all costs! If you knock, people are likely .tp tell you where to get off straight away, whereas if they get the book thru the door they're more likely to take a look before deciding what to do! If books aren't left out, I just pop a note thru saying I'll pop back another time!
I think if you're gonna do it, you need to go into it with the frame of mind that it will tale a while to build up and you won't make a shitload straight away, it's like any business, it takes time to build a client base etc! Atm what I make is really just funding things I'd buy anyway, like shampoo and other toiletries with a bit left over, but at least I'm saving on buying them elsewhere iykwim?!