I place mine against a wall with the bases facing outwards. Let the wax cool and set overnight, You don't need a thick bed of wax to ski. You should, in fact, scrape off any excess wax after the wax has had time to cool down. Placing each ski back in your vice, scrape the excess wax with the wax scraper. That's a good question.
Some people say to scrape it right back down to the base.
Others say to leave a thin layer. Personally, I tend to leave it a bit thicker than most people. I like to see the matte finish of the scraped wax. About the thickness of a business card. If your skis have a groove, as my Telemark skis do, scraping the wax out the the groove is tricky.