No worries.
The 'over thinking' also puts people off. The thinning of paint is not absolutely critical. I used to be a chemist, I know what exact measurement means, and thinning paint for spraying it definitely is not!
You just need to experiment to find a consistency which will give the coverage you want, and pass through your brush freely. In my experience almost every pot or tin of paint is different, so giving ratios is pointless. Experimentation and experience are the only way to get it right most of the time. I do it by eye and the look of the paint in the cup. At the risk of sounding like a smarty-pants, I honestly don't remember the last time I got it far enough off to cause any problem
Don't be afraid to up the pressure you spray at. I was originally, many years ago, given some lessons by an
airbrush artist rather than model maker and that is where I learned to spray at the relatively high pressures I use. Many airbrushes won't even work properly at the pressures I see touted about on some modelling forums!
Once you find the magic formula for the consistency of the medium you are spraying and the pressure you spray at, stick with it. There is no need ever to alter it and potentially provoke all sorts of issues. I continually see people advocating extra thinning and ridiculously low pressures to spray Luftwaffe mottle for example. Bollocks! I've been spraying it for years in exactly the same way as I spray everything else.
The acres of camouflage on the 1/24 Spitfire float plane were sprayed in EXACTLY the same was as the squiggle on this little Ba 349 Natter.
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Good luck and have fun. After the initial learning curve you will find that airbrushing is not a dark art, in fact it is a doddle and great fun.
Cheers
Steve