Hi
I am a newb too but did lots of reading before I got my flock. I am a believer that a mans/womans home is their castle and people should mind their own business. If your house is individual rather than part of a developement then neighbours won't know for sure if you have a covenant.
My chickens are less smelly than rabits and make less noise than our dog and cats and our 5 children.
You can't compare the costs for the eggs alone but when you figure in that they help rid your garden of pests and fertilize it, we now grow a few potatoes, rhubarb, runner beans and peas. I also planted some herbs spesifically for the birds but they don't like them. I am spending more time in the garden and so are the children and strangely enough I can always rely on someone to help me clean them out or watch them when free ranging round the garden or collecting the eggs it is early days but everyone in the family seems to want to be involved, even my garden hating husband has been doing those jobs that have needed to be done for months, so I'd say go for it.
Alison W