170,709
Yeah,for the mot part, you'll be fine just splatting stuff into it without having to worry much.
Unless it's something made from non-superwash treated wool, in which case temperatures and spin cycles can cause it to shrink and felt up.
Most other things are sewn from preshrunk fabrics and should never shrink more than about 10% depending on the material. If they do, they're probably faulty.