Working
with waste canvas is the same as stitching on Aida fabric. 
Once the waste
canvas has been tacked onto your chosen background
DO ...
Align the waste canvas weave with the fabric weaveUse a hoop (where possible!)
Tack waste canvas to fabric before stitching
Stitch into the centre of the square
Use tweezers to pull out the threads, ONE by ONE
Pull out the threads vertically first.
Rinse project thoroughly in cool water to remove all traces of wc starch from the fabric
DON'T ...
... use a blunt ended cross-stitch needle. A sharper point is required.... forget to dampen your work before removing the waste canvas
... be tempted to pull out any threads until your design is completed
... panic if the coloured threads run in the water. Keep rinsing until the 'bleeding' stops.
... give up if you cannot remove all the waste canvas - you may need to snip the waste canvas away close to the design to prevent the waste canvas snapping when pulling out with the tweezers.