You have to start somewhere, right?

[bounceswoosh]

I tried one narrow trail but it was all slightly downhill and twisty. I spent most of it cross training (walking).

A female downhill racer gave me some great advice: If you're ever not sure you can ride something, walk it. There will come a day when you will approach it and know you can do it, and that's when you ride it.

Sounds like you're doing the right thing =)