The Nemesis

Normally I don't have much of a problem with mods and whatnot for my games, much less games with mods that basically self-install. But for whatever reason I'm having a hell of a time getting everything to work right. I've tried several supposed "walkthroughs" of the installation necessities and order and at best when I try to start a game it crashes to the desktop. At worst I get some funky error message that seems to equate to there being a missing file or something.

I wonder if part of it might be that I have the GOG.com recently download versions of both BG1/TOSC and BGII/TOB, which to the best of my knowledge are fully patched. I also have current versions of the following mods:

BG1 Fixpack
BG1 Tweaks
BG1 NPC Project
BG1/TOSC Text Update
Unfinished Business
BGQE
BG2 fixpack
BG2 Tweaks
Ascension
Turnabout
Oversight
Widescreen mod
BGT

So my questions are:

1) Are any of these things redundant or unnecessary when taken all together (for example, if I'm using BGT, will I need any/all of those BG1 mods? Also am I missing anything that is necessary?

2) Given what I have and whatever else is suggested I may need, what are the specific installation steps and order that I need to proceed to make everything work. Assume for the sake of this that I'm a gibbering moron and no detail is too small.

I realize that this might be a tired question but I can't seem to find anything else that appears to specifically and entirely meet my needs.

Thanks for your help.