I've owned a Cycle Hill tire changer since 2009 and have changed over 200 motorcycle tires with it......both
tubed and tubeless. Some tires are easy and some aren't......stiff sidewall, low profile tires can be very tough
especially if the rim has minimal drop center. Tall, soft sidewall tires like trials tires can almost be mounted by
hand without tools and with a little lube.
As noted previously, warm tires, adequate lube, and technique help with the install. Rim locks complicate the install
and and I have not had the pleasure of installing two rim locks on a wheel since the mid 1970s! One is not too bad.
I use the NoMar dismount bar for both tube and tubeless tires to prevent scratching the rims. The NoMar bar is also used to install tubeless tires.....lots of lube, a warm tire, and one continuous sweep of the install bar works almost every install. NoMar lube will
not corrode a rim.
I use Stubby plastic tire "irons" to install tubed tires to prevent pinching the tube and to prevent any rim scratches. They are a little
thicker than regular metal irons but will not scratch a rim.
https://stubbytiretools.com/