ConraDargo I believe you should perhaps read the thread, at least the first sentance of the first post
mackster, I have NEVER had nor seen any problem when flashing a lite.
Lots of people seem concerned about it and believe it may be able to "brick" your DS but in my experience you would have to really screw up for that to happen.
Insulate your shorting tool and you should be fine. I'm not going to guarantee you won't stuff up but I really think that if you can flash the phat you can flash your lite.
Check that thread I linked above, it is very descriptive.
Oh yeah, congrats on the phat flash!