I would not use starting fluid trick on todays wheelbarrow tires,that are more like inner tubes with tread,chances are it'll blow apartt and kill ya!..
I change a lot of smaller tires on lawn tractors,and other things..hand truck $" tires SUCK to get mounted,some have rims with no "bead" for the tire to seat against,like they were supposed to use tubes,but never came with any!...
I usually get stubborn tires seated by taking out the valve stem core,then I soap up the tires beads good,and if I cant get it to pop the beads,I get a steel bucket or pan that is slightly larger than the rim is,and place the pan under the tire--then I use something to cover up the lug holes and center hole like a round lid off a pan ,and press down on the rim & tire while applying air pressure--the air escaping from the lower bead gets trapped in the bucket,and forces the tire onto the rims beads...usually works slick,and its harder to decribe how,than to DO it....I have done thins to car tires when mounting regular sized tires on wide rims,you just need a bigger bucket!--a steel trash can works for me!..