step 1 - learn how to coil a rope
step 2 - learn how to throw a rope.
step 3 - approach the lock slowly with minimum steering and aim for the place where you want to be, dont scrape all the way along the lock. Be aware of whats behind you , but dont let them rush you. You can practice 1,2 & 3 at Laleham, remember stop before you throw. remember also that Laleham has current, locks do not.
step 4 - STOP. Do not throw any ropes before you stop. do not stop violently. do nothing until you have stopped.
step 5 - do not jump off. Throw ropes. NO crew or visitors to jump - ever.
step 6 - DO NOT PULL ANY ROPES until BOTH are over a bollard. Heaving on bow will just pull the stern out
step 7 - when you are satisfied - engines off.
Lock courtesy is pretty much take your turn to enter, take your turn to leave (unless you end up significantly in front of the boat you were behind - he will normally invite you to leave first). Do what the lockies ask you to, and always move up the layby and up the lock if there is room. Except when the lock is empty or near empty then stay nearer the lower gates so that lockie can fill the lock faster for you.
You only have to watch a locking in progress to see who knows what they are doing and who's skill you would like to imitate
If you would like some weekday tuition I can assist I live nearby. send me a pm