Do you have a good sense balance?
The way I check customers bikes is......
Put the side stand down, left hand on the left grip, right hand on the seat and pick it up to center balance.
Then hold it there with your left hand and lean down enough to see the oil level. (KEEP the bar STRAIGHT at all times).
Not as hard as it may sound.
Maybe have the right side near a wall just in case.
Try it a few times with a buddy standing on the right of the bike.
But, gotta have a good sense of balance......
Or you could get some wood blocks to put under the right frame tube.
Experiment stacking them till you get the right amount to reach level when they make contact when you lift the bike up against them.
Probably the better way to go for a new guy.
Edit: Oops, just noticed this is an old thread. He's already got it figured out by now. Oh well.