On prep: Razor bevels remove quite a bit of skin. The need for prep is probably overstated. If new guys are having mystery irritation, I will recommend "skip prep". Prep for me means clean. A simple wash with soapy fingers or a gentle cloth. No scrubbing! Rinse and lather up, using the coldest water that's comfy. Heat is good for prepping hair, but it adds to inflammatory processes in the skin. It's a balancing act that should probably be dictated by outcome and not desire. I promise cold water is more comfy than all-day shaving irritation! There are many people who do a lot of prep and have comfy close shaves, and this post is not for them. Whatever level of prep that results in irritation free shaves is the right amount. But for new converts, none just might be worth a try in an effort to solve irritation.