"it's not what you know, it's who you know"
I am currently a one person after hours operation, yet with professional marketing and website for the impression of a large company. None of it matters if nobody knows you or you have no relationships. I have a tough time approaching people I know or asking friends and family to pass out my business cards because its a pride issue - but all of my work except for one job has come from doing just that - networking and just putting yourself out there.
But I will admit that a nicely designed yard sign in a high traffic area will in fact draw attention as I had a few GCs contact me with just one sign.