RR, I had the same probs when I bought mine
But it is possible even when the bike is loaded up.
You need to coordinate 3 points of movement at the same time ;-)
Left hand on the handle bar, right hand on the grip under the seat and step with all your weight onto the centre stand, tugging at the handle bar and the under seat grip at the same time
, lugging that piece of heavy metal UPWARDS and
Only when we pause to wonder
do we go beyond the limits of our little lives.