The mainsail is the bigger of the two working sails. On a fractional rig that means depowering starts at the mast, not at the forestay.
Slab reefing that works
Two lines led aft, both reachable from the companionway. A boat this size does not need single-line reefing and its friction.
Marking the halyard
Mark the halyard for each reef. Then reefing is pulling to a mark rather than judging a shape in the dark.
When to take it
Earlier than feels necessary. She sails better upright, and a reef in at 18 knots is faster than a rail down at 20.
