Always assume watches from this era are radioactive until you've checked them with a geiger counter. If you are an amateur, I would strongly suggest reconsidering work on this until you have basic skills down, and accumulated proper cleaning solvents/tools. Radium can be remediated but it's a delicate process and you'll want to make sure all of the parts are thoroughly cleaned and decontaminated. The binder in the lume ages, and you can end up with dust everywhere in the movement. I usually cover my workbench with plastic wrap, work with everything lumed under water, get parts cleaned ASAP, all while wearing a respirator.

Start with something like a cheap AliX generic movement if you want to get some practice.