Just re-read you question, mixing chemistry in powder form does require you to be a bit careful. In an ideal world you would have a clean air supply across your face, a powered clean air mask is one solution. But living in the real world, you could mix your chemistry in a very well ventilated place, or even mix it outside, providing there is no wind.
Wearing a face mask is probably one of the safer ways to mix powdered chemicals.
You may not have a set of scales, this would be required to measure your chemistry into different amounts. A cheap set of electronic scales should be alright, if you really get into mixing your own chemistry from bulk purchased chemicals, then by that time you would have an idea of what kind of scales you may find best. I myself have a triple beam set of scales, no batteries, no electronics, just weights. I've had my current scale set for maybe 30 years, they will see me out.
https://en.wikipedia.org/wiki/Triple_beam_balance
Mick.
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