usually they say idle for half tank and less than quarter throttle the rest of way through the first tank... temps around 160
let it cool all the way down
then second tank quarter throttle drive around the whole time.. temps around 180 then let cool the whole way down
third and 4th tank.. half throttle driving around temps can go up to 190-200 and let them cool down the whole way
then 5th tank start getting on it a little and start tuning the engine.
if you let your engine idle the first two tanks like some people say then you will have a crap glow plug by the time you try to start your 3rd tank and you will think that something is wrong.
My way of doing it has worked for every nitro i bought new... over 15 and still buying lol
hope this helps