I use it regularly and have done for years
Key is to have the car really clean as mentioned above. Remember a piece of grit converts it to sandpaper..
Lubricate it well with spray to stop it dragging. Too dry and it leaves clay that is then hard to remove. Even tap water in an old hand pump Windolene type bottle is enough
Turn and fold the clay to keep clean surface
Of course if you drop it bin it, don’t try to rescue it
As above you may find the cloths easier and more convenient. Try one - I use a 20cm flat cloth
As always clay is part of a proper process of clean, clay, polish, seal & wax )or whatever routine you choose), so I tend to do a panel at a time if I’m short of time.
Enjoy it’s therapeutic