A loop to start your work with can be made by folding two strands together and than tie a knot in the lot, it works but does not look good.
If you just cross your strings and than tie a first knot, pull not tight and pull the other string at the back into a loop. Tie a second knot and the loop is fixed.
At the end of the work you want your strands to stay in place. With the plastic strands sold for scoubidou you only have to pull the last knot extra tight. Than cut the ends short. Sometimes you have to help a bit, warm the strands a little, often holding them in your hand will be enough, pull the knot extra tight and leave overnight. If the knot is still tight the next day it will stay tight.
I run out of string but I am not ready by a long way.
Place a new string along your little end and tie two knots with two strands together. It shows, you can hide it a little by making the ends thinner, just pull on the plastic.
More info on the net, on my site
www.home.zonnet.nl/willeke_igkt or on another. Use your search engine for 'scoubidou', 'knots' or in Dutch 'knopen'. Many pictures of projects you can find at www.yoarra.nl
or on another. Use your search engine for 'scoubidou', 'knots' or in Dutch 'knopen'. Many pictures of projects you can find at www.yoarra.nl