Step 1:
I taped tin foil to a paper of about 20x20 cm or 8x8 inches, see next picture.

Step 8:
Repeat step 6 over these 3 lines

Step 6:
Press this edge inwards by making an
inside reverse fold over these 3 lines
(=valley-fold over the line in the middle
and a mountain-fold over the 2 outer lines).

Step 13:
Mountain-fold over this line, do the same on
the other side, see arrow.

Step 12:
Press the edge inwards by making
a mountain-fold over this line, do the
same on the right, see purple arrow.

Step 11:
Now the model looks like this.

Step 10:
Press the model inwards between your
fingers. Make the same folds on the
other side

Step 9:
Prefold over this line, it's a little on the
right of the center-line

Step 5:
Press the edges inwards from aside to open
the end, see next picture.

Step 7:
Rotate the model, with the other edge in front.

Step 3:
Continue making valley-folds until you've
reached the upper edge.

Step 2:
Valley-fold over this line.

Step 4:
This is the final valley-fold.

Done!
And this is a DIY-video for folding the table knife: