Fisher East is a pretty nasty trail. There are bypasses around most of the ugliness, but they're pretty tight in places, and body damage is a real possibility if it's slippery (my truck has the scars to prove it). Even in the 36" - 40" tire category, there are about a million stories of 12+ hour runs on that trail when the carnage starts. Plus, it's pretty much all mud, which gets boring in my opinion.
Now, I haven't run it since last fall, so things could be very different these days, but I wouldn't really recommend a newbie on Fisher East unless you have a lot of time, you like using your winch and you're in a group.
S