Yes, you can definitely learn that in a week.
Use your discount tables to get each year's discount factor, or do 1.08^-1, ^-2, ^-3 etc.
Then multiply each year's cash flow by the discount factor and add them all up to get the NPV.
If the cost of capital is ex-inflation then you need to strip out inflation.
Then the rest is just guff

. Problems with the method include the assumption that the cost of capital will remain constant (beta of the firm's risk will remain the same), that no projects with better opportunities will present themselves, ignores the 'fit' of each project with the current strategy of the firm, ignores staff's ability to operate / be trained on machinery, etc.
Also the project's riskiness might not be consistent with the firm, so the cost of capital of the firm migth not be a fair reflection of the cost of capital of the projects.
Measuring the CoC is also inherently problematic.
For bonus marks mention sensitivity analysis, i.e. how much the cash flows would be affected if the CoC changed by x %.