How to sculpt a High Poly Mesh in Detail? I'm having an issue with high poly sculpting in blender.

Here's my mesh. As you can see, it's composed of 11M polygons, which is quite a lot.



The thing is, when I want to sculpt little details, I'm limited by the size of my polygons. I'll exagerate it in order to show you.



But when I look at tutorials online, there seems to be no problem with polygons at all : 



What am I doing wrong? Thanks in advance.
You could enable Dyntopo(it is in the toolbar) and set it to a high detail. I would search for a tutorial on its use. Hope this helps