There is a whole section on 'Headlining Removal and Installation' in the 'Bentley Publishers' workshop manual.
(A-19 pages 3 to 9).
If you were unaware, the Bentley series are exact reprints of the original VW technicians manuals used in VW workshops of the time.
They have one for VW types 11,14 and 15 1958-1960. (your car)
I cannot recommend this book enough for anyone owning and maintaining a vintage VW.
They cover everything, totaly accurate...straight from the horses mouth. Not the cheapest book (around £50)but If I did not have one it would defo be on my Xmas list.
Pete.
Stock......the new custom