I have been reading through some walkthroughs, and I seem to conclude that they are a bit too confusing to read through. It starts in the Mortuary, and after that there´s like 20 different turns to take, so to speak. It´s nice to know about quests and rewards, but if they are simply listed in no particular order or their description cross over into different sections, then it´s not that big of a help to me. Which walkthrough do you consider to be the best (least confusing/unstructured)?

When looking for walkthroughs for any IE game, I tend to prefer Dan Simpson as the writer. And it just so happens he's got one for PS:T.
http://www.sorcerers.net/Games/dl.php?s=PST&f=Torment/planescape_torment.zip

Yeah, I knew that one. Seemed somewhat unorganized to me...

Interesting, I though Simpson's was the best as well. There is always gamebanshee.com and planetbaldursgate.com. They actually have maps and such.

The last 3 walkthroughs listed on SP are all equipped with maps too.

It depends on what you mean by "organisation". Dan Simpson organises his by area (he did the same with the BG walkthrough), and lists everything you can do in the area the first time you enter it. Major quests that can be resolved only much later in the game are mentioned, usually with a "you will only complete this when you have spoken to X" or whatever, and then they get their own "back to..." heading when you can complete the quest. So the walkthrough is organised by area, but you can still complete the game if you go through it in the order presented. Seems like the best kind of organisation to me :)

And while we're on the subject... I wouldn't use the walkthrough unless you're replaying the game to see all the things you missed (and in that case you don't need to be able to "follow" the walkthrough, as you can see what you missed in each area). If it's your first time and you get stuck, I'm sure we'll all be happy to give a nudge without spoiling anything. But, it's your game, do as you please :)