1. your assumptions are correct. keep it clean and if it's deep you'll want to keep it open. flushing with a solution of betadine and saline is best. Hydrogen peroxide can actually impede new tissue growth (good for the first few days, but that's it)
2. you are at fault, i'd just chalk it up to a learning experience.
2. you are at fault, i'd just chalk it up to a learning experience.