Go to this web site. It teaches you how to properly trim ears. It's very important to keep the hair off the ears to assist them in standing up. Also the foot pads need to be kept free of hair. Otherwise, you'll have them slipping and slidding all over the place. Bad for legs and knees. Buy yourself a Whal Peanut at Sally's Beautify Supply for ear and foot pad trimming.
Jon-An's Yorkshire Terriers
Buy the way make sure you blow dry and brush. Pups this young should be kept dry and not be allowed to air dry. Besides puppy mats need to be brushed out.