Like others here have said, tube tires on steel rims are pretty easy to mount and dismount. Since I change tires on my Triumph pretty regularly, I made up a tire mounting stand and bought a Marc Parnes tire balancer. The balancer works well on the Norton rims, too.
Here's a pic of the stand, back when I was beginning disassembly of the rear wheel for re-lacing:
Here's a pic of the balancer on the same wheel while truing it:
The tire stand is just a junk car rim screwed to a 5 gallon bucket, with a split garden hose on the rim edge. Really works well for the modern 17 inch bike rims, but handles the 19 inch ok.
If you do a web search, you can find pretty detailed step-by-step instructions for mounting and balancing tires, with pics.
