You have 10 days off work. Flights to Punta Arenas cost $1,100. You want to do the W Trek or the Huemul Circuit. Then you find out the campsites you need are sold out for the entire month. Sound familiar? Patagonia does not care about your spreadsheet. Wind gets to 100 km/h. Rain falls sideways for eight hours. Refugio beds disappear six months in advance. The people who struggle are not the unfit ones. They are the ones who assumed this works like a national park in Colorado or the Lake District. It does not. This guide covers the actual…