First the game's new and you just do whatever. Good times.
Then you really figure out what the game's about, how the guilds work, how to do (or avoid) the main quest, and how leveling and gear works. If you're a power-gamer/micro-manager, you may stay at this point, happily, forever, eventually making a "perfect" character with maxed stats and best-in-slot gear.
However, there's a third level of play a lot of long-time vets get to. In the third level of play you've done all that and don't care about perfect anymore, in fact you may find it boring and too easy in terms of in-game challenge. So you intentionally roll characters that will not be perfect, and which may in fact never level beyond level 20 or level 25 (by picking some majors you will never use). You don't worry about efficient leveling, you just let the game come to you, using skill and cleverness (especially with regards spell creation and item enchantments) to overcome what perfect stats used to make mindlessly easy.
The best advice I think I can give a new player is to just play. It is an awesome game. You don't need to be "perfect" to progress in it. If things get to a point where it seems too hard you can always nudge the difficulty slider a step or two to the left. That is not a crime. This is a single player game, meant for you to enjoy however you like. It's also not a game where you can see, learn, and do everything in a day, or a week, or even a month. It's a big game, with a lot to it.
I posted this in response to a new player's question (on a different message board, after first answering his question about how efficient leveling works). This thought of a 3-step approach hit me recently, both because of comments I have seen some of you make here, and in how I am approaching my latest character. I've realized I am far from new to this game, and than I'm also been-there/done-that when it comes to "perfect" leveling. Having learned how the systems work, I'm now using them not to be perfect, but to be rewarded for playing as I like (via careful choice of majors pre-start and then just playing the game as it comes to me thereafter).
Do you share this view? Do you have a different way of looking at it? Let me know, I'm curious.