Everything in this handbook is subordinate to coming back from the dive.
This course loads you more than any before it: four charts to place, a camera to hold square at a fixed height, a slate, perhaps a light, and a station to keep track of. Task loading is how good divers end up out of trim, off their gas plan, or in contact with the reef.
No capture, frame or station is completed at the cost of buoyancy, buddy contact, gas reserve, no-decompression margin or environmental contact. There is nothing wrong with leaving a science task uncompleted.
An unfinished frame costs you very little. The capture set already carries spares, and a station can be finished on another dive.
Charts go on dead substrate or sand only — never on living cover, never wedged or weighted in, always placed from neutral buoyancy and trim. Count them out and count them back in before you leave the station. Everything that goes in comes out.
Gas and no-decompression time are both hard limits, and whichever arrives first ends the dive, complete data or not.