While rewatching Star Wars my skin was crawling while watching Luke practice saber technique against a remote on the Falcon. There's no way I'd want to be in the same room with a beginner waving a lightsaber around, let alone a beginner with his eyes covered.
Samurai apparently practiced with bokken to reduce training injuries. Do lightsabers have lower power settings so that a wrong move while practicing doesn't sever a limb or chop through the hull into vacuum?