So your hands become your feet. Pretty simple, right?
How to do simply do it:
Start at a wall, sit down and place a block (or whatever other object you choose) in line with the soles of your feet while your sacrum touches the wall.
Then come into downward facing dog and proceed to walk your legs up the wall.
You literally want to create an L shape with your body, so that hips are stacked over shoulders stacked over hands and legs extend straight back to the wall.
WARNING: This pose, when done properly can be more challenging than it looks! It helps to first or concurrently work on building core strength. Planks, when correctly done, are your best friends.
Some tips and tricks from the L-Shape:
-Really work on the alignment, keeping the body over the foundation (your arms), parallel to the wall.
-Engage the core: core, core, core muscles. "Button and zip up those abdominal muscles"!
-Externally rotate your arms (not the hands) if not straight.
-You can try lifting one at a time, away from the wall.
-With one leg lifted, you can then try pointing the toes of the other foot, to further focus on less wall contact.
Be aware that one person's handstand can certainly look different than another's, it's about finding the core strength, keeping lift throughout the body (feel like your pushing away from the floor), and having patience...this things don't magically happen overnight. Unless you're just "that person" ;-)