Can you edit your .vimrc file in vim, and reload it without restarting vim?
If you're editing it, you can reload it with:
In general, to re-load the currently active .vimrc, use the following (see Daily Vim):
Even better, you configure Vim to watch for changes in your
Source: this answer on SO
Note: this particular method watches for the many variations of Vim config filenames so that it's compatible with GUI Vim, Windows Vim, etc.