You can both thin it out and cut some length off if you like, that will help
On the front leg feathering point the thinning shears toward the rear of the dog, make a cut, slicker it out and move down the leg. Keep repeating till you get what you want. Be sure to do both the inside and the outside of the leg. Then cut the feathering to the length you want, when you get to the high pad on the back of the leg, angle the scissors in toward the back of his foot.
On the hind legs you can trim the stuff on the back of his hocks pretty short, then "raise his skirt" by trimming it.
Belly feathering you can just shorten up with a straight scissors. Ditto for ears, if you choose.
One thing that helps is to use the clippers with the number 10 blade to clean out his groin area and armpits