I did a stint in a DR (Cardiff) before I started Med-school
The guy that was essentially mentoring me, was very experienced (he was an ex surgeon, and retired after I finished working there)
Dissection is really good fun, and the closest you'll get to cutting living human flesh. I miss dissecting now (We work only on prosections)
Prosections are good, but best if it's still hands on, but you can learn similar amounts from pouring over an atlas.
Doing it yourself just makes it easier to remember imo. And with a good dissection guide (tells you what stuff is, and where to cut) learning to handle a scalpel and the other tools of the trade, the art of refracting the skin, etc.
invaluable.