The first and most important things are elbow grease, patience, and making sure to line brush.
When you bathe make sure to use a good conditioner.
I find that if you high velocity dry it keeps it from getting as tangled as when you let them air dry.
You can make a brushing spray with some water and conditioner mixed.
Or you can find something like the stuff or cowboy magic.
Evie has been going through her first real coat change for the last month or so.
If I remember my info correctly it may last for a while.
Not quite sure about that.