How timely! I'll be doing some trim later this week. I usually finish, then install and touch up. Been doing the stain, brushing on the first coat of poly, then spraying the rest (sanding between coats). This method works well for me. When installing, I will keep the stain handy and a few q-tips. I stain the cut portions just before attaching to make touch ups easier.
To a small child, the perfect granddad is unafraid of big dogs and fierce storms but absolutely terrified of the word “boo.” – Robert Brault