Schools teach mathematics, reading comprehension, and how to follow instructions. With those 3 skills people can do their taxes.
Sure, and since laws are just writing you don't need lawyers at all, everyone can just represent themselves. In fact, why do specialties exist at all? Programming is just typing, and everyone can type, so everyone can program. Surgery is just cutting things, so if you can use a knife, you can be a surgeon.
I mean, how could someone not easily know what to do when given such clear instructions as:
"Refigure your depletion deduction for the AMT. To do so, use only income and deductions allowed for the AMT when refiguring the limit based on taxable income from the property under section 613(a) and the limit based on taxable income, with certain adjustments, under section 613A(d)(1). Also, your depletion deduction for mines, wells, and other natural deposits under section 611 is limited to the property's adjusted basis at the end of the year, as refigured for the AMT, unless you are an independent producer or royalty owner claiming percentage depletion for oil and gas wells under section 613A(c). "