clearing a joint

Hi everyone.
Listen this is my first post so here's hoping it goes well. I am a student in Northern Ireland and have a quick question regarding assessment. For example before doing a shoulder assessment using Cyriax you should clear the next proximal joint which is the Cv spine now could someone explain or even suggest where I might go to find information on how to clear a joint. I know how to clear the Cv spine but I am having trouble with the hip and knee. I know there is overpressure involved but not sure in what movements.
Thanks for your help and time.
Hobbes.