One of the main challenges is finding places willing to link back to your site. It can take hours (literally) of searching to find a single site that...
- Will publish a one-way link to your site
- Is actually worth getting a link from
Backlink builder then searches a wide variety of sites that accept new links, and are willing to do so using the keyword you specify (i.e. a contextual link). It then returns hundreds of candidates within minutes, saving you hours of "search and explore" misery.