I'm wrong handed to begin with, but I do practice with both hands, because I shoot a little IDPA competition, and they usally have one set you have to shoot with your off hand.
I probably don't practice enough with my weak hand. Hell, I probably don't practice enough, period. But half your shooting practice weak hand because of the corners in a house?If you intend a pistl for defense, you MUST practice off-handed shooting. The corners of a house or wall aren't always favorable to your strong side.
I spend 50% of my ammo shooting off side.