I wanna concentrate on 5 different skills: Illusion, Restoration, Sneak, Speech, and Two-handed Weapons. Will I be able to max out all 5 or only a few of them?

You stop getting perks after level 50..do the math. And why max them? Only use the perks you want. 

@The_Laughing_Man: Well how many points does each skill tree take, or are they all different amounts?

You can max all the skills i think, but not perks.

Different but related question: how many levels would it take, ignoring the 50 cap, to max out all of the skill trees?

You probably won't be able to get every perk in all 5. But a lot of the perks are kinda worthless anyway, so you can probably get most of what you want.

And they work like a tree, correct? You need the novice Illusion one for example to get the ones that branch off it?

@The_Laughing_Man said:

You stop getting perks after level 50..do the math. And why max them? Only use the perks you want.

No, you don't. You stop getting perks when you run out of skills to increase your character level with, which is supposedly around level 70. The only thing that happens at 50 is leveling slows down a lot.

@Beforet said:

Different but related question: how many levels would it take, ignoring the 50 cap, to max out all of the skill trees?

There is no cap of any sort at 50.

The soft cap, which is determined by the point at which you run out of skills to increase your level with (or in other words, the level at which you've reached 100 in all skills), is level 70.

EDIT - Looking at your five skills, and assuming a soft cap of 70, you will probably not be able to get all perks in all five of them. There are 72 total, and you have a supposed maximum of 69 points to spend with the soft cap, so you'll have to cut some perks somewhere.

@Louis0nFire said:

And they work like a tree, correct? You need the novice Illusion one for example to get the ones that branch off it?

I mean you can't just choose any perk on the tree (even if you meet the skill requirement), right?

@Louis0nFire said:

@Louis0nFire said:

And they work like a tree, correct? You need the novice Illusion one for example to get the ones that branch off it?

I mean you can't just choose any perk on the tree (even if you meet the skill requirement), right?

No, you can't. However, for perks that have 5 ranks, you don't need to fill every rank to get the next perk. So you can have 1/5 bow damage and still get the zoom for example

@Pinworm45: Okay. I just wanna make sure I didn't spread myself out too thin by working on 5 perks instead of concentrating on only 1-3 or something.

Keep in mind you don't need to get every perk on a skill's perk tree. Most of the skills will surely have at least a couple you won't find worthwhile and won't need as a prerequisite.

@JP_Russell: But was it dumb to take the first one in each of those 5? Because that's what I did so far with my first 5 perks.

@Louis0nFire said:

@JP_Russell: But was it dumb to take the first one in each of those 5? Because that's what I did so far with my first 5 perks.

Honestly I wouldn't worry about, just pick what you want. Actually, it's probably a good idea to do it that way. You have it out of the way early on.

Then just put perks into whatever area you think needs improvement

@Louis0nFire said:

@JP_Russell: But was it dumb to take the first one in each of those 5? Because that's what I did so far with my first 5 perks.

No, of course not. Have to open up the starting perk if you're going to get any of the other perks in each of those skills.

@JP_Russell: Awesome then, thanks man.

Wait for the DLC that raises the level cap.

@Hizang said:

Wait for the DLC that raises the level cap.

Elder Scrolls' leveling doesn't work in such a way that you can just increase a hardcoded level cap, because there isn't one. The soft cap is determined by your skills, and the options Bethesda has of adding more skills or increasing the max level of each skill beyond 100 wouldn't really make any sense as a carrot-on-a-stick since you're already not necessarily intended to actually get to the soft cap, anyway. Basically, the concept of a level cap and min-maxing within that cap isn't a driving force behind Skyrim's level system.

@JP_Russell: Shivering Isle did it didn't it?

and Two-handed Weapons

@Hizang said:

@JP_Russell: Shivering Isle did it didn't it?

Nope. No such thing in Elder Scrolls games as a hard level cap, by the very nature of the leveling system. :P

Shivering Isles simply added some new spells and items, in terms of its potential impact on the base game.

It's been stated, but you can get all your skills to 100. You won't get all those perks though. You level by increasing your skills, but unlike Morrowind and Oblivion, there's no set number of skill raises to level up. If your Destruction is 71 and your One-handed is 23, it takes fewer skill raises in Destruction to level up than One-handed (and you'll have better perks available in Destruction since your skill is so much higher), so it pays to specialize.

You stop getting perks when you stop leveling, but I don't know what the actual cap is. You reach the cap when you can't increase anymore skills and it's the same for all races.

@AhmadMetallic said:

@Louis0nFire said:

and Two-handed Weapons

No, not again, nooo, noooooooooo, dear god the NIGHTMARES

Dude, 2Hers are so, so fun in this game! :P