I'm 5'6", 145lbs, and have no issues getting either bike on the stand.
Hold bike upright, push centerstand down till it touches the ground , rock the bike a bit to make sure it's touching both feet, then push down on stand while puliing up and back on the grab bar.
I had a smaller bike that almost took a cherry picker to get on the stand, thing only weighed 300lbs or so, but was way off on balance.
A smaller tire installed, or a lowered bike changes the whole geometry so it's much harder.
Ken.