Aside from the math, the method of orienting the map is really easy.

Put a side of the compass along a longitude line (vertical) and rotate the map until the top is facing magnetic north. Then rotate it more in the direction of the MH on the variation legend until you have the angle difference equal to the variation.

The actual method can vary depending on the compass.

A protracter makes things easier for planning, but isn't really needed. Just be careful not to plan on a table with any metal parts.