I have all kinds of rim and tire combinations, including the dreaded Matrix rims and some overfilled with rim tape as well as new studded tires. The most challenging I found the small 16" wheels and yes for these I have studded tires too. The short circumference gives you less wiggle room than long. In each case, though, the patience and thought can win the day - I do not recall a combination that could not be mounted with bare hands only.
The most difficult tires I ever had to mount were the 7" diameter front tires on my Dad's wheelchair. I had to get them hot in the clothes drier, and even then they were a struggle, even using a bead jack.