What's the most difficult thing, in launching a product alone?

I've been working on a Product, Bitgrain for last some time, Well it has been a side project, but solving a real issue of lots of designers.
For me the most difficult part of the entire project was spreading out the word. Till now blogs have been working well, and have planned a launch soon on PH, let's see how it goes.
Share your pain points when launching products alone : )