If you ever get a flat while riding, you'll be thankful you chose a rim-tire combination that facilitates easy mounting/dismounting. This is why I cannot recommend Campagnolo Omega rims, which are a very tight fit with almost any tire. It takes only a small fraction of a millimeter in outer flange diameter to make a huge difference in mountability.

A related tip: If you use innertubes, avoid foldable tires and tires designed for tubeless applications, because these tend to have an even tighter fit. Pre-stretching helps somewhat, as does, as plonz suggests, solar warming. I do both. Also, before riding, take the tires off the rims and remount them, to loosen them up a bit further.