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Depends who you talk to and what your local snow is like... factory wax is OK for a day or so but mostly just to keep the bases and edges nice while the ski is in the shop.
I'd do a normal hot wax and just use a bit more than usual to make sure you really saturate the bases. Then scrape. Heaps. It's not like they're race skis, if the wax job is a bit shitty it's not going to ruin your day.
Check your forward pressure - have you set up those bindings before?
If you have WAY too much forward pressure on the 18 DIN ones, when you clip the boot in the toe piece will tilt forwards (there's the vertical release people say doesn't exist....)
This, with the caveat that some (particularly carving skis) have bindings that only fit into a bespoke rail system that is built into the ski.
Depends... if they have the same mounting pattern, and you're careful, no problem at all.
If they have a different mounting pattern, you ideally need to have 10mm between the old holes and the new ones. The old ones should be filled with epoxy or properly plugged. If you can't get 10mm you considerably increase the chances of the binding pulling out, and you might be better off changing the mounting position 5-10mm in either direction to get better placement.