How to rotate a chiral carbon I know that to correctly assign R,S priorities I have to rotate the above figure until the H is projecting into the page (away from me). However, I don't know how to rotate the H and the rest of the molecule when the H is in the plane of the page. 

When I imagine tilting the molecule back I get a see-saw shaped molecule ... obviously incorrect.
Imagine viewing it from right side:  


H is upwards and CH3CH2 is downwards.
OH is leftwards and CH3 rightwards.
H and CH3CH2 are backwards(from right) so they must be on vertical line of Fischer projection and similarly for OH and CH3.


Alternatively:


Put the dotted wedge CH3 in any vertical position let it be bottom.
Then imagine all other groups to be planar, we see in clockwise order:


CH3CH2 , H , OH

Draw them similarly on the Fischer projection in clockwise sense.!



Note that both are (S)