Changing coolant, what to be cautious about?

[240meowth]

i got red line's water wetter coolant, which can decrease the temperature up to 20 F if you run just water and that.  But it dosn't decrease the freezing point of it.  since i live in california, i don't have to worry about my radiator freeze over.  i'm thinking about doing this coolant change tomorrow, i've had this bottle sitting there for a month now.  I'm going to use preston's radiator flush throught first then add red line's water wetter w/ distilled water.  But, what are the things i have to be cautious about while i'm draining the radiator?  there's a radiator bleed valve or somthing some where, is it where the header is or is it on top of the engine, or is it both?  and what other things do i have to watch out for?

[S13Grl]

Do you know how to flush the radiator or are you asking for instructions?

[240meowth]

i'm asking about those valves or somthing, it's some bolts you have to loosen or remove to drain the coolent completely, where are these bolts?

you dont have to remove any bolts.

just take the drain plug out and that will drain your radiator. of course there is still coolant in your engine.