[burner31]

I've used a short length of 2 X 1/2 board covered in cloth, so as to not mar the upholstery, and drive it home with a hard plastic mallet or your hand, #1 thing to do prior to striking is ensure the clip nose is in the hole, if it's not lined up right, you'll know...and it may not be a good thing.
New clips are notoriously stiff.