Step 1: Find a wall
Step 2: Run and jump at the wall
Step 3: Repeat
Step 4: If you try this 10 times and it does not work, walk a while and find another wall. Failure to do so will result in falling through the void.
Step 5: Repeat till you noclip
Just bash your head against something long enough
Or you can just not try to noclip
Bonus tip: try it near a power socket
Don't
What do you think?