If you aren't willing to work with leaded solder, I wouldn't recommend building electronics kits. Yes, lead is toxic. The safety precaution for this is to wash your hands after you're done soldering (and obvious things like not eating while you're soldering, not eating the solder, etc).
Lead free solder flows poorly and is very difficult to work with. I end up with many kits every year on my repair bench that are built with lead-free solder and would have worked properly if the builder had used leaded solder instead.
I'd recommend not overthinking things like this too much...
Lead free solder flows poorly and is very difficult to work with. I end up with many kits every year on my repair bench that are built with lead-free solder and would have worked properly if the builder had used leaded solder instead.
I'd recommend not overthinking things like this too much...