There's a half-dozen ways to select, cut and paste, but since I'm very keyboard oriented I'll write out how I do it.
1. My cursor is somewhere on the screen. I spot the thing I want to change.
2. I move to the left of the thing I want to change using whichever is appropriate of these keyboard commands:
- Up, Down, Left and Right arrows to move by one line or character.
- Ctrl-Up Arrow - next paragraph up.
- Ctrl-Down Arrow - next paragraph down.
- Ctrl-Right Arrow - next word right.
- Ctrl-Left Arrow - next word left.
- End - end of line. (Ctrl-End = end of document)
- Home - beginning of line. (Ctrl-Home = beginning of document)
Once I've reached the beginning of whatever I want to highlight, I hold down the Shift key and then use the above commands to move - holding down Shift means it will select whatever I move over.
Ctrl-C = copy to clipboard
Ctrl-X = cut to clipboard
Ctrl-V = paste from clipboard
If you prefer to use the mouse to select, use the mouse to select, but I have never been able to cut and paste as quickly using the mouse as I can using these keyboard shortcuts.