It does "work" like other 3-D shoots in that you shoot one arrow per target. The targets are not going to be in the wide open (not very many of them any way). They are difficult because of debris (trees, bushes, etc.) in the way but all the shots are possible; there will be some of the "kill ring" exposed.
On Saturday, it's all longbows and recurves (longbows are wooden arrows only). At the end of the day they take the top 5 shooters in each class and have a shootoff; that is fun to watch. It might be fun to participate in; I wouldn't know that because I've never shot well enough to get there.
On Sunday, it's selfbows only (wooden arrows only). Again the top 5 will have a shootoff.
It's a fun shoot but you are likely to lose or break some arrows so bring a few more than you think you'll need.
Also, if you get a chance, take the velvet tour. It's worth your time.