Good Morning ! .. Now we can get serious
Magic wand only works in some applications for your background erasing application.
I usually select the layer and press .. CTRL+J ... This will make a new layer with a copy.
Then start erasing what I don't want.
If you know the keyboard Shortcuts .. This is pretty easy,
I Start erasing large .. then work in with a smaller bush for the finished picture.
The Bracket keys ... [ ] ... Increase or decrease the brush size.
Click .. then ... Shift click .. will connect the clicks .. and continue with shift clicks.
To increase the accuracy of my cuts .. I zoom in with the scroll wheel.
Then .. at any time .. I can press n hold the space bar .. this will callup the hand tool where i can reposition my work.
when the space bar is released .. you will return to what you were doing.
I also have a set of customized Brushes .. various sizes of Soft/Hard and Round/Square that helps.
Want a copy ??
Then, I usually grab the magic wand .. select the erased part (non-continuous) ..
Expand and Feather the selection then erase again.
This cleans up the edges of your cuts