Reaper:
I've done it numerous times, for both male and female Player Characters.
1. Most frequently, I've played through as a soldier/guardian. Less frequently, as a soldier/consular. I run with a 14 intelligence as a soldier/guardian and place the majority of my skill points in persuade, with any extra in treat injury and awarness, with that order of importance.
2. I play the PC version, so I take full advantage of Yavin Station. I would consider this to be the difference maker in successfully completing a full lightside game ending as often as I have. The Force/Guardian Lightsaber Crystals are powerful, not to mention some of the other equipment that Suvan Tan carries. The real advantage though is being able to get great prices on selling items after defeating Suvan Tan 10 consequtive times at pazaak, thus gaining his significant discount. This works on stuff you sell to him as well as stuff you buy. So I typically will clean out a planet, then go visit Yavin Station, sell my junk, rinse and repeat. Having credits really makes KotOR easier to win Lightside, especially since you can turn down cash opportunities in lieu of lightside points during conversations and quests.
3. I also find that using the force lightning shock line of Jedi powers to be way way overpowered. I use this power exclusively and also play in jedi robes. Even though lightside, the only penalty I've ever seen in using this power is simply the force points cost due to alignment. Not really a problem when you have 150-200 force points and 1-2 force storms kill everything. Especially if a melee/lightsaber specialist....two storms and two whacks and everything is dead.
Stasis and Wave are also very powerful. Any power that effects groups of enemies or buffs you, really.
Master speed is also very sick--extra attacks...too sweeet.
4. I pay particular attention to attributes. I start off generally with:
St 12, Dex 12, Con 12, In 14, Wis 14, Cha 12. This gives me at least +1 in all categories and the important ones can be boosted with items. I typically put my additional points in Wisdom, mainly because force powers are so powerful....and healing is just too easy lightside. High Wisdom just does so much for you...resists enemy force powers, increases the effectiveness of your force powers, increase effects of treat injury skill, increases you force points pool....etc. etc.
5. For the final battle with Malak, I load up on Stims and Life Support Packs. That's why some points in treat injury are important. As is your wisdom modifier.
6. Another critical piece of equipment besides the Star Forge Robes near the end of the game is the Circlet of Saresh. +5 Wis is ridiculous and when you add it to the Star Forge Robes it throws your Wisdom into insane levels...mid 20's.....just sick. Add attibute points to this and it becomes.....
7. Finally and most obvious, is being extremely nice when talking to everyone. Refuse rewards at every opportunity and take on good deeds. Be so bubble-gum sweet that everyone's blood sugar goes up just looking at you. Perhaps that's why you glow so much....:laugh:
8. I never had any trouble with XP. In every case, my character is level 20 long before I get to the star forge. You can farm xp in many places in the game....it is tedious, but there are some good areas. I have never really need to resort to this. Just follow Game Banshee's walkthough and you'll have more than enough xp.
9. I also stick to Jedi as my NPC support. Jedi are just so powerful with their force powers. As lightside, you save Juhani and she is probably one of your strongest Jedi. Add Bastila and Jolee and between these three you really don't need anyone else. After Dantooine, I typically go to Kash, then Tatooine, then Manaan, this way I get Jolee early. When I lose Bastila later, I go with Jolee and Juhani. No problems really. Partying is harder darkside because while you might keep Bastila, she's gimped and you kill the J's, so you are forced to go with other party members, like Canderous and HK-47, who aren't as strong as jedi, especially on the star forge, when endless waves of enemies are coming at you.
All these things seem to help me master & end the game fully lightside.
James.