I am an old fart, 5' 10" 165 pounds...unless I am on uneven surfaces, it is easy to get it up.
As mentioned already but I am stressing this point...GOT TO HAVE BOTH CENTERSTAND FEET CONTACTING GROUND when you step your weight onto the lever tab.
With your weight on your left foot, push the centerstand down with your right foot until it contacts the ground.
Now slightly rock the bike towards and away from you, to get a feel of the 2 legs making contact.
Once you are positive both feet are making even contact THEN stand all your weight onto the right foot and lift with right hand.
Try this exercise:
Get someone to 'spot' you. Have them stand on the other side of the bike, just in case it goes away from you. Now practice the 'rocking' to get the feel of both centerstand feet touching.
Now stand onto the lever with right foot but don't use any arm strength, don't try to get it on the stand...just get the feeling of being on a 3-point stable position.
Front tire, 2 legs of centerstand makes a tripod. Get comfortable with this tripod effect.
Learn how to go from the tripod to back to both tires on the ground again.
You will go from a standing position (weight on right foot) to standing position (weight on left foot).
In between, you will bend at the waist and stick your butt away from the bike. This is the key to controlli,g the offsetting weight (so the bike can't fall away from you).
Once your comfortable with that you can let your spotter go and you will be OK.
If you fail to get it up, you just bend and stick butt out and you are back to sidestand safe side.
(Sorry for the lengthyness of thiis)