With resin when a print fails, you just get a half print stuck to the bottom of the resin tank, no spaghetti. The most common cause of failure is the part falling of the lifting platform, typical due to poor supports, but rarelybecause the platform is crooked.

Leveling is pretty easy on most printers, just loosen the bed, remove the resin tank, placing some thin cardboard in it’s place, lower the platform until it touches the cardboard, and lock it in place.