Ok first off sorry if there are other threads about this but i searched for a bit and couldn't find what i was looking for ( im prolly just blind) anyway i want to mod oblivion and skyrim at the same time and would like to know how to go about useing Bash/BOSS NMM and various other mod tools for both games without getting things mixed up or messed up.

You are going to be using different utilities for the most part. Wrye Bash is the most recommended mod manager for Oblivion. You will want BOSS for your load order and TES4Edit for cleaning mods. Some people also use OBMM instead of Wrye Bash, but at this point Wrye is updated more often and has a more powerful set of tools. You can still use OBMM as it is the easiest choice for managing .ini edits and shader mods, although you may not need to do either.

I wouldn't recommend using NMM for Oblivion because it was released quite recently, and the majority of mods on Tesnexus were never formatted for it, so there is pretty much a 50/50 chance of stuff actually working. This shouldn't be a problem (I hope) for Skyrim.

http://tescosi.com/wiki/Main_Page is the most up to date modding guide out there for Oblivion at the moment. Just about everything you will need to know is there.

Thank you for the NMM tip, it looks like it works fine with Skyrim, though i only have a couple mods installed, but my question was How. To answer my self, i guess i would just install Oblivion's boss in its folder and skyrims boss in skyrims folder and just run them like normal, but for bash i guess it has a way to select which game i want to work with, anyhow thanx again guess i will just fire up bash and see for my self like i should have from the start. =)

http://www.gamesas.com/topic/1084204-bain-mod-installation-projects/ is better than NMM.

PS I'm biased.

Biased or not, you're right.

Right enough that I use BAIN for TES3/4/5 and am about to switch to it for Fallout 3/NV. It's awesome. I just wish there was something like it for more games.