Editing backgrounds out ....

Been trying the method in Affinty where you select the subject and then invert and change the background to, in this case, black. Tis not easy with my heron photo from today as there are areas where the edges are not clearly defined. You can clearly see the foliage between the fine feathers on the breast of the heron. It's fun (and frustrating).

I expect that you folks know of easier ways.....