QUOTE(DubbzNYC @ Jun 27 2006, 11:09 AM)

I've heard that it's actually beneficial to do the main quest early. When you reach much higher levels some of the latter parts of the main quest become exceedingly difficult, or so I 've been told, due to the fact that enemies level up with you, but allies do not. I am currently level 16, and I just presented Martin with the first artifact. I have been doing Arena, Fighter's Guild and Dark Brotherhood quests while slowly progressing the main storyline.
from what i heard, Kvatch was like that, but other than that, there wasn't many problems. however, i'm doing everything all at once. i'm about 35-40 hours in, done a fair amount of dungeon hunting, lots of the Guild quests, and maybe 1/3 of the main quest (basically after Kvatch and Weynon Priory).
either way it shouldn't be THAT hard if you level up right. you could be a level 40 but only worked on your major skills and been pretty weak in the rest. this would make all your attributes mostly +2/+3 when you level up as well. i'll admit i haven't been 100% at getting as many +4/+5's as i could, but i've done pretty well with it.