How do I push/pull an irregular surface?

I drew a backhoe bucket and wanted to punch two holes in the rounded surface.

Barrel and Bucket.skp (121.2 KB)

I tried intersecting surface but get no intersecting surface error.

For small holes like that, just draw them so the entire circle is on a single face and push them through. Turn on Hidden Geometry in the View menu to make the edges between faces visible.

Thanks Dave that worked.