Changing a flat at -35C is even worse... am thankful I have only had one flat in all my years of winter riding and don't get many flats during the rest of the year either.

I use talc... it is liking having a million little ball bearings to help you out and keep the tyre and tube from sticking / dragging and for some reason, which may be that it works, always start at the valve stem and work my way around and usually don't have a problem with anything except the most difficult tyre installations. have never used a strap and if I need to use a lever I like Schwalbe's blue levers as they are stiff and have yet to break one.

Park levers are crap, aside from their shop grade ones.

I can mount most tyres by hand... comes from well practiced technique and and from having mechanic's hands.

Worst tyres I ever mounted was a set of Avocet TT30 folders... they were 630 tyres going on a 630 rim and it was like they had been made a few mm too small but once mounted and run they were fine and could be removed and reinstalled without too much grief.