You might want a slightly longer rope (40m) as there are 2 pitches really, Balcony and Pen Pot. The first can be free climbed but is much better rigged as a pitch in my opinion - it has been the site of a least one serious accident.
The rigging starts on the other side of the boulder choke at the bottom of Mouse Aven (the last fixed ladder) with Balcony Pitch, where at a 1m step down in the passage there is an 8mm through bolt (no hanger or nut) on the right or alternatively use the scaffold bar. There is then a 'P' hanger on the right after about 4m where a scramble down (2m) brings you to a ledge with another P hanger, there is then a drop of 3m to the floor. The rope rub on the 3m drop is difficult to avoid, careful prussiking helps as ever. There is a 12mm through bolt (no nut or hanger) out to left at the intermediate ledge if I remember correctly.
Having reached the floor below Balcony pitch the rope can be rebelayed to a boulder with a P hanger in before following either of the 2 variations Damian mentions - there are obvious P hangers on the main rig, whereas the parallel route (on the left going in) has 12mm throughbolts and in situ hangers. Either variation is a single straight drop of 12-15m. A short scramble down below the pitch leads to a crawl which gradually enlarges before joining the main stream passage at Cross Stream Junction.
Hope you enjoy the trip it's a great cave with lots of variety and plenty to explore at 15km long.