Ensure your paper can be wet without excessive buckling.
Dilute your paint so you aren’t filling up the tooth of the paper.
Allow the paper to dry completely before adding pastel.
Do the bare minimum of underpainting, not the whole picture.
Use the biggest brush you can, this helps eliminate detail.
Don’t fiddle, keep it simple with big abstract shapes and no detail.
Don’t use your best sable brushes. Sanded pastel papers (they are usually the water tolerant ones) eat paintbrushes.