So I basically just want to know the viability of this would be, mostly early game survivability.

No traditional weapons; going to use sneak, lockpicking, enchanting, Destruction, Conjuration, Restoration, and Illusion.

I will join the College and the Dark Brotherhood.

get illusion up fast for quite casting.

You'll blow you're cover with almost every spell you cast until you unlock the silent casting perk. So early survivability could be an issue.

Those two, in tandem, are the most powerful combination of an two schools of magic or skills in the game.

Even sneaking everywhere you will level it quite slowly without using sneak attacks to advance the skill.

As long as you have one focused damage skill and a defensive skill or strategy, you will be viable in the game. Everything else you do is of sheer personal choice.

Even without being very stealthy early game, you will be a dominate force if you implement Conjuration and Illusion. This will hold true for any level of difficulty. Even Legendary. You will literally only be leery of being hit from those swinging axe hallways.

I'll keep that in mind.

It's almost a little too good. Use illusion to make the enemies fight each other...then either join in, or wait till one dies and resurrect him as a zombie. The enemies will be fighting themselves until they are all either dead or under your control as a thrall.

You can hit people with illusion spells from range, too, which is convenient for inciting a riot that isn't too close for comfort