Guidance about modeling this Karambit knife!

Hi friends,
I’m gonna model a high quality Karambit knife like the below one.
I need some guidance and advice about how to set about the modeling process.
Note that I just want to model the grip especially its curvature form and its finger places. The grip isn’t quite flat. It has a slight curvature surface.
Please guide me.

For the finger indentations:
Create edge curves.
Create section curves.
Sweep2 using Add Slash option if needed to control how shape.