yes i have done it. granted, i got mastery of the DS way before i even got to the first star map planet, but i thought the LS was more fun, tireing, but fun. here are some hints for you.
1 start your game up as a soilder. you get 10 vitality points each time you level up. its good to have, trust me
2 when you be come a jedi, go with counsalur(sp) instead of just getting one force power each time you level up, you get 1 more every other time you level up! so you get like 5-8 more force powers then you would if you were a gaudian.
3 cheat codes. i know its cheating (duh) but it makes the game a whole lot more fun AND easier. plus, you can add/subtract LS/DS points at will. So you could be a complete dark sider, and still fallow the path of the light.
4 if ur serious about the light side, you have to be super patient, and willing to walk - alot. and dont get attached to your credits. and if you can, get every quest possible, because they either turn out LS/DS
5 always save your game. i cannot reiterate this enough to some ppl. save save save. if you dont like how something turned out, go back and load your last game
thats all that i can remember now... i havent play it in awhile. i just got KotOR II so... yea. good luck.