i would like to know step by step in how to do a led conversion if possible.. whent to radio shack to ask and the guy looked at me if i was losing it or sumtin.. but this is what i want to do.. first of all i have a 6th gen sedan.. ok the lights on the doors the lil lights i would like to convert them into a single white led the real bright ones.. but how do i do that? then i would like to do my dash lights blue the not the spedo lights but the heater and ac control lights.. and also need step by step help.. so please i can use all the help i can get.!!

i have seen at pepboys they have leds that allready are able to hook right up to a 12v but they dont have the white ..only blue.. ok thanks again for the help