...but the amps that'll kill ya!
240 volt is really just two legs of 120 v until you cross or join them.
A little safety and good work practices and you should be good to go. Years ago I hired a gentleman who worked as "the electrical teacher" and his business model was teaching DIY'ers how to be safe while doing your own work.
With his teaching and guidance I replaced my entire service panel and all basement wiring while upgrading to a 200 Amp service. I did everything except the final hot connection from the meter hub to the main service lugs.
Since then I have taken several electrical classes including an NEC class, and I've installed several sub panels, and wired a few garage shops. It's neither hard nor particularly dangerous once you know what you are supposed to be doing.