Building successful niche sites is basically a process, if you know the steps you need to follow, and how to compelte each step it can be a fairly simple thing to do.
BUT it all depends on getting one thing right from the start – keyword research!
If you pick the wrong keywords then it probably won’t matter how good your process is, you will fail!
And before you even get to the stage of doing detailed keyword research you have to do a whole load of brainstorming to come up with ideas for good new keywords and niches to go after!
The whole process is long winded, fiddley and ultimatly turns in to a tedious “job” very quickly, usually resulting in people cutting corners at best, or not bothering at all…