I had a very poor night last night - it gets like that when you are old! - seemed to be awake every hour or so. When it's like this I find my mind roving from subject to subject, often thinking pessimistically about things and aspects of my life which are less than satisfactory. Thankfully I usually cheer up when fully awake when the day dawns and it's time to get up!
Last night though, pessimistic as ever, I found myself "worrying" for the originating poster in this thread. I found myself thinking Ok, here we are trying to advise someone which radiator hose to pull so he/she can drain the coolant. Then I thought, but hang on, I can't really think of a vehicle I've done this too where it was all that difficult to identify a hose to pull so it's highly likely this person has little experience of working on cars? Next I thought, draining the system is actually the easy bit. Refilling and especially bleeding out any trapped air is the hard bit - Isn't it? So I'm ending up thinking to myself this person really needs someone who has a modicum of mechanical knowledge and some small experience by their side when they are doing this. My fear is that he/she may not properly bleed the system (or fail to bleed at all) and end up with an overheating engine due to air locking and, worst case scenario, maybe blowing a head gasket etc.
I suppose what I'm saying is that if you're really not confident in what you are doing don't risk doing serious damage to your car. A small independent garage would find this a simple task and shouldn't charge much to do it for you. - Or, roughly where do you live? maybe a more experienced forum member could give you a helping hand if you would like?