As a club we have 4 of these types of boats. The Challenger is a lot bigger and faster than the Access Dinghy. The boat has 3 hulls and is known as a trimaran. The Challenger only has one big sail and it has additional lines to enable shaping the sail to maximise efficiency when sailing, it also has the capability of taking a Buddy as well as a sailor. The Buddy sits on a trampoline beside the sailor and controls the rigging if required.
A sailor can sail this boat alone but the Challenger does require a little sailing experience, however the less experienced can always be accompanied by a Buddy
If you don’t feel confident enough to sail the Challenger solo this is something you could build up to, there is no pressure.