the easiest way to lift the rear wheel:

1. move to a position that is comfortable, where you feel you will have leverage and balance while minimizing injury potential
2. bend knees ever so slightly, in preparation of force dispersment
3. Firmly place hands onto underside of saddle
4. in one motion lift saddle upwards, until desired height is achieved.
***note, front wheel may or may not remain on the ground***

how can that be so hard?