Yeah, most map groups will have everyone bring a handful of maps(you can carry an open one in your key items, a sealed one in inventory, and another in your saddlebag - any trips to the retainer bell to clean up inventory allow you to restock). Then they take turns on whos map to do next. The most common loot rules are owner need/rest greed or FFA, but just discuss this as a party before you get started and it should be fine. Most people get quicker at identifying the chest location the more parties they join(both from practicing the skill and because there are a finite number of spots). But at a certain point it comes down to luck(with drops, portals, doors and spawns), so good luck!