heh! I didn't bother learning how to do it for a long time. Relatively recently I discovered that the JOSM 'multipolygon' menu option does everything for you if you select the outer way and the inner "island". Easy!

So I do use it now occasionally, but mostly these, like many relations, are fiddly bit of intricate complexity which we could do without.

I tell you, this horse track is a work of art.
osm.org/?lat=49.277153&lon=-0.001944&zoom=18&layers=M