I have never pre-shrunk interfacing and have never been aware of it shrinking later - but now I am reading more sewing books I keep being told that I should pre-shrink all types of interfacing.
So, do you do it? And if you do, how?
Also, do you cut out individual pattern pieces of interfacing and then fuse them to the fabric pieces; or fuse interfacing to the fabric and then cut out the shape ? I think I`ve seen that called "block fusing"