brushing soapy water on the tire bead and rim. It helps slip the tire on (or off) the rim a lot easier.
Good reminder! I have been meaning to add that into a kit for taking to my daughter's tournaments because their skinny tires make my mtb tires seem like they fly off. I prefer to change their flats since I use plastic tire levers and not tube-pinching, rim nicking ground down screw drivers.....
Oh, and sometimes I'll even wear an old pair of bike gloves to help get more grip on the tire when trying roll the bead over the rim.