I do it all except that I don’t make any research. The weather is always the same at this time of the year and the only available information is temperature, tide and wind speed. I ask the guide to give me the intel I need. Seabed public info is limited. So the guide tells me, here there should be mild or no current. Or here, the currents can be strong. Then, on site, I decide if I want to dive (only if we have a boat and viz is good. No dive with strong current from shore even reef dive), refine the plan with directions, Poi, depth, bottom times with a main exit plan and contingency. I do full gas management. I am very thorough. Sometimes, too much for the guides