Trouble with selection tools

[rich2005]

Just a suggestion.
Using the quick mask. Either for the whole selection or what I often do, tidy up a selection made by other means. Bottom of the select menu or Shift-Q or that little bottom left icon toggles.



Paint white to add to the selection, black subtracts, X key toggles FG / BG colours. making it easy to add/subtract.

Paint tool with shift key draws in straight lines, can clean up a border.

Toggle off to get the selection.