1) Trace the image that you have printed out on to the tracing paper (alternatively you can print straight onto the tracing paper itself.)
2) Turn the tracing paper on the other side and tone with the HB pencil the areas which have drawing underneath.
3) Now turn the tracing paper back and put it on top of the watercolor paper sheet. Stick it together with the blue tack
4) Now trace the picture once again. Because you have toned the back side of tracing paper with the pencil it will reproduce the cat's outline on the watercolor paper.
5) Look underneath the tracing paper often to make sure you have transferred all the details. When the outline is complete remove the tracing paper and go over the image on the watercolor paper comparing it to the original printout or the image on the computer screen, correcting it or making it more clear as you go along.