I give them a treat when they hop in the sink, and sit...
I put warm water on them and talk to them all the time...
I do not let the water get down into their nose and they seem to take comfort in me holding up those little snouts. Everytime they do exactly what I want I give a little taste of something... If they try to jump...I give the stop or quit command and hold them until they quit the action...I do this as I talk calmly and let them see that MOma does nothing to hurt them...
My voice and my actions are fluid...this works with my horse as well...
I reward good behavior and scold bad. Consistency is so important...
If one is afraid of the clippers... I let them run until they get use to the nose, before I clip their ear... but the main thing is a routine and stay consistent if I can.... I try to build a trust daily with them... hugs kisses... but I do it in a form of play...it helps...
hope a tip in here will help...