Well i'm very confusing. And because of this confusion i can't play the game too much. So i need your help guys.

I have an Assasin chaarcter at level 44 while i have an another Necromancer/ Summoner character at level 23. And i want with booth characters end the main quest. But there's one problem. My conjurer character didn't finished the Civil war, while my Assasin character did. Homever, play with my Conjurer character is much more fast and easy than play as a assasin. You guys know, you need to go behind everybody without miss then backstab him. if not, -blam- you are screwed.

Also with my assasin character i need to get inside
While it's the opossite with my Conjurer, . So what i should i do? Finish the m ]ain quest with my Assasin character or with my Conjurer?

Beating it fast isn't the point. So the slowest way FTW.

TES Series - slower the better.

Holy yeah!

Edit: But i already done the civil war 3 tines. Sol it's starts to svck after a time.

The good thing is, that you can buy enchanted items that will help your character in the areas that they are weak in. My third character is actually an assassin as well, but I leveled my archery. So, in the embassy, I just took out the stupid Thalmor with an arrow while in sneak mode!

I also carry Sanguine Rose with me and if there are too many people or I need a distraction, I just point the staff into the room and let my Dremora fight, while I pick off the targets from the shadow lol.

So, I think you shouldn't have issues with either character. Just have fun and play the quest line with both, see which one works better, try out different tactics, etc. I need to head into Blackreach on my assassin as well and I'm actually looking forward to it!

Both of these are great answers, OP. If you are wanting a time trial, then by all means go ahead. But know that this is a game that is designed to make you think through problems (both confrontational as well as moral), and that going slow and taking your time will always be more beneficial to your character.

I've got a Dunmer Assassin right now, Level 21, and I'm having a blast! I haven't touched the Main Quest in any of my characters yet, and this one is the exact same. I'm just wandering around Skyrim completing the Side Quests, buying Houses, completing the metric butt-loads of Miscellaneous Quests... I'm just going very, very slow and enjoying the world.

Besides, in the RP I love to interject into these games, my character is wanting to be the best Assassin that Tamriel has ever seen and thus is wandering around doing all of this because practice makes perfect.

Complete the Main Quest with one character first, just pick one. But pick the one that you are having the most fun playing. That way, any Quests that you do complete from here on out you know you will be having fun doing it.

I've found you can stroll through the embassy without really much trouble, they're going to know you were there afterwards no matter how careful you are, anyway... so sneak is good and not required.

as to the Falmer, they're actually easier if you do sneak. and you can come back to "clear" blackreach if you really need to, so do the sneaky thief/assassin thing in a straight line when you get into blackreach towards the arrow and go straight to your destination. when it's all done you know where the backdoor is and can go down there any time you want to explore and mine and do the quest down there when you have the time.

Agreed.

with muffle and maxed sneak perks, the falmers should not even know you are there.......