I'm a hobbyist, too. I haven't used Silver Efex in a while, mostly because lazy. That and I don't like that I can't make my changes non-destructive when using it with Lightroom. Plus the resulting hundreds of megabyte TIFF file. So instead I pretty much stick with Lightroom. I do it this way:
1) Edit the image (in color) for the best look
2) Hit the Black & White button.
3) Adjust edits for the effect I want. Note that once converted to Black & White an additional B&W panel is available that allows you to adjust the luminance (?) of each color. The target brush works quite well for selecting things to lighten or darken.
Example: in the attached image the red and black wires were not as separated in brightness as I wanted after conversion. I lightened the red. I used the target brush to darken the (mostly blue) insulators that were part of the crimped on terminals. Otherwise they were the same tone as the red wires in the original conversion to black and white
All that said, I really don't know what I'm doing. I'm curious as to what other people do.