Lots of people complained here about sanding, but to me shaping a plane from a rectangular box to a shapely plane is one of the magic parts of aeromodelling! It can be done in half an hour if you use a razor plane first. ( I havent yet built a US60, the plan is still in the post! I am talking about other similar models where the nose/ cowl needs shaping )
There are several tricks

1 Use a razor plane to start, with equal strokes on each side to get a symmetrical shape.

2 glasspaper should be fixed to a large block. The block is used in an arc which follows the intended shape of the curve. Again a few strokes 1 side then the other to keep symmetrical.

3 A Permagrit block is far better than glasspaper and quicker. It also seem to produce less dust, perhaps the ' granules' are larger, and no dust from the glasspaper itself. Expensive but you only really need 1 large block, double sided coarse and fine. ( I like the angle ended block )

4 Work outdoors to save clearing up!