I started killing the TRang, cause, lets face it, they suck, and I hope I can still beat the game. I left the "kill the Rapax" mission unfinished cause I couldn't figure out where to put the perfume,>> Do a very detailed search of 1) Your journal/chat history 2) Marten's bluff (poke and prod buttons) and if that doesn't work 3) this board.
and I've left the idol in Upper Marten's bluff, because I don't know how to get my guy back if I take it,
>>The flower is the clue, the solution is probably on this board somewhere... do a search for idol ;)
and I don't know if I even can get him back with the TRang as enemies. I've got the note from ZAnt for the Mooks, but is that all I need from the TRang?
>>I think you need *a* note a some point.
Also how do I get rid of all my junk. Does the Trynnie chemist make potions or items, and if so, how do I get him to?
..Camp or combine. Search for recipies on this board 
Lastly, I don't want a total spoiler, but could someone help me understand the few things which are absolutely vital to beating the game,
..I'm nowhere near there myself.. but I get there are 3 important objects you need, and a bit of info about them..
so I don't freak out about all the other missions and details (although they are also fun). I basically just wanna know what absolutely has to happen in the game, so I know if I have to start over.
..Most likey you can pick up where you are now... you 'faction' rating might be suffering, but from what I hear there are ways near the end of the game to 'pull it out of the fire' if you get my drift.
1. In the game you go not need the T'rang or the Umpani the only thing that completing missuins for them gets you EXP in the case of the Umpani and EXP + gold in the case of the T'rang. Killing Z'ant got you the all important letter which is needed to aquireone of the three objects.2. Getting the idol gets you a key when used with the words of Marten this key allows you access to a place where there is a chest with something that will protect you against the effects of one of the objects you seek.
3. Fuzzfas makes one special potion but you need tu give him the blue feather you found in order for him to make it
4. When you find the idol you lose a member check the swamp for someone to talk to.
5. Re #2 above if you don't mind being a bit crazy you can dispence with the protection.
6. The ONLY things the MUST be done to complete the game is...
a) aquire the 3 objects and b) place the objects to attain the Cosmic Circle. While it helps to disarm the bomb in the Savant's Tower it is not needed. You just get ending #4. How you get to a. and B. is up to you. Enjoy.