3 or 4 extra blades should be plenty.
I've typically only needed 2 for Mule Deer, when using just the Havalon only. Because I carry out the hide as well, and want to cut as striaght as possible. I now always use regular blade plus Havalon. Regular blade for cuts around knees. For separating the backstraps out, those cuts where you slide along the ribs/vertebrea as a guide. And for separating the skull at the atlas joint. Can sometimes do the atlas joint with the Havalon.
Big thing is with the Havalon, you gotta think "Finesse". Not man-handling it... finessing it like a surgeon.
I've typically only needed 2 for Mule Deer, when using just the Havalon only. Because I carry out the hide as well, and want to cut as striaght as possible. I now always use regular blade plus Havalon. Regular blade for cuts around knees. For separating the backstraps out, those cuts where you slide along the ribs/vertebrea as a guide. And for separating the skull at the atlas joint. Can sometimes do the atlas joint with the Havalon.
Big thing is with the Havalon, you gotta think "Finesse". Not man-handling it... finessing it like a surgeon.