o christ yeah dont do it in place, dodgy as sin!!!! with the throttle bodys you have to be really clean, and wash out the tbs at regular intervals (i used a petrol cleaning tank, water then slosh some petrol thro at the end would do) you can end up with your tb jamming else.
heres a link should be quite self explanatory once your in there DO NOT touch anywhere within the butterfly sweep it'll fuck yer idle(it'll run high=eml)
viewtopic.php?f=86&t=5628&p=54320&hilit=port+polish+tb#p54320
(thanks to blue se2)