Crouch to get through the hatches.
For a spacewalk head to the Quest Joint located on the starboard side of Node 1.
Do never jump in space.

Adapted from a model by Johnson Space Center Integrated Graphics, Operations and Analysis Laboratory (IGOAL), NASA.
Source images: Blue Marble collection at NASA Visible Earth, NASA Goddard Space Flight Center and The Milky Way Panorama by ESO/S Brunier.