Oh, one other thing; Resin powder and dust is best not inhaled at all.
Cut off the blocks outside or where you will get lots of clean air (more then an open window or door.
When sanding, the best advice I ever received was to use wet & dry sandpaper, used wet, and sand back the seams and mould lines.
Stops dust getting in your nose, eyes, hair, lungs, and contaminating your work space.
I started with about 600 grit, then 900, then 1200 for polishing....Higher number means finer sanding.
And this is where sanding gently and steadily will pay off. Too fast, you may remove more then you want too, and spoil fit of the figure.
Good luck
Cheers