Is Choosing a Niche Scary?

Have you ever had someone give you a really lengthy explanation of how to do something and even though you understood it, you find yourself speechless when asked to repeat it back to them?

I'm not sure if the metaphor makes sense really, but I'm wondering just how many people absorb all the Internet Marketing there is, then when it comes to applying it to a niche outside IM, they feel paralyzed. Let's face it - in the IM world, you can pretty much pick out certain factors people are using - he's building a list this way, she has this backend offer, etc., but this isn't the case in non-marketing niches.

I'm going to be honest with you... I'm considering starting a website in a niche that I'm very passionate about. Though it's not a concrete-need niche (such as weight loss), it would do AMAZINGLY well for Amazon, and is in dire need of a decent digital product. I don't know of anyone here who's combined a content-website (with Amazon/other physical product affiliate links) along with a digital product minisite... this is where inertia kicks in.

As far as my whole IM experience is concerned, I made money through a MMO blog I started a year ago as a raw raw newbie (and recently resurrected - though instead of trying to teach MMO, it's a record of my own experiences), along with freelancing. Even though I've managed to make money back when I didn't know diddly squat (had I been smart back then I would've scaled it up big-time, instead of going after another shiny idea I had that didn't pan out like I wanted it to... oh well), I don't have my own product yet, and that's lame.

Sooooo... instead of making my first product about MMO (all reputation factors aside, I PERSONALLY would feel like such a poser if I did that), I'm branching out... into niches where IM tactics really don't feel so old and tired.

Has anyone else felt like that? I can easily create my own MMO product without much research, but applying that knowledge to brand new niches... I'm just wondering if that step alone has scared anyone else, some to the point of quitting altogether.