Almost all aid gear is rated for body weight only: aiders are for standing, daisies and fifis are for hanging, and the climbing rope is always what catches a fall. The lead cycle is place, clip an aider, step down and bounce test, step up, clip the rope. Never clip one carabiner into two pockets of a sewn daisy; BD says a mis-clip can be as weak as about 2.2 kN. Jug on two ascenders and tie a backup knot to your harness every 5–7 m. Never create a fall onto an ascender or progress-capture pulley: HowNOT2 stripped the sheath at about 4.7 kN. For a first pair of ascenders (one per hand), choose between the BD Index and Petzl ASCENSION, about NT$2,700–3,000 each in Taiwan.
Hauling means the leader trails a 6–8 mm static line and pulls the pack up at the anchor through a progress-capture pulley like a Micro Traxion, so the second climbs without it; haul only on steep, hard pitches without loose rock, keep the line tight and never yank a stuck bag. On big walls, haul 30–40 kg bags with a Pro Traxion and body weight, and dock the bag before unloading the pulley.
A big wall usually means NCCS Grade V or higher, a route that needs a night on the wall. El Capitan's The Nose is written VI 5.9 C2: VI means two or more days, 5.9 is the free climbing, C2 the hammerless aid. The leader climbs and fixes the rope, the second ascends it with ascenders and cleans the gear, and meanwhile the leader hauls the bag. Taiwan has nothing of this scale — Long Dong tops out at about 70 m — but it is a good place to master trad, anchors and multi-pitch.
The five disciplines differ in three ways: what stops a fall (water, yourself, a partner), what you climb on (rock, ice, snow) and how long you are committed (half a day to more than a week). Boulderers are closest to deep water soloing, provided they can swim; big walls need trad and multi-pitch skills; Taiwan has almost no natural ice. Of North America's 2024 climbing accidents, 71 were alpine, 52 trad and 35 sport — totals, not rates, so they cannot rank which is most dangerous.