I don't think you can ever over-prepare here. [He can speak from the perspective of experience on that.] Especially if you try to make the scope of your preparation broad.
[Knowing about herbs and plants will definitely be useful, but even in case they aren't available, other medical knowledge will still be useful.]
no subject
[Knowing about herbs and plants will definitely be useful, but even in case they aren't available, other medical knowledge will still be useful.]