You purchased fiberlene so I assume you are aware of placing it between the ski base and the iron to absorb the molten wax. I do this for hot waxing when saturating the base with prep wax and to clean it, and never use cold scraping. I actually use lint-free shop towels that work as well as fiberlene. You can easily see the dirt and black impurities from the base in the towels. Once the ski cools, you still need to brush. 3-4 cycles of prep wax at the end or start of the season to get it back to neutral and ready for the daily harder waxes. Sometimes I'll repeat the base prep cycles mid-season if I have the time. Definitely do this after a base grind. For a recreational skier not worried about race times, this is good enough for me.
I lean towards Jacques lower and slower wax method to penetrate the prep wax into the base, so multiple passes at the lower temperatures for those waxes. I'll drag the center of the iron over the edge which adsorbs the heat faster to equalize the base temperature. Absorb the excess wax, cool, brush out, and repeat. A lot less messy than scraping and a big time saver.
I tune the skis, usually just diamond stones unless more is needed, before waxing, which deburrs the edges and prevents scratching the iron. I leave base grinds and serious edge work to a trusted shop, but those can be hard to find.