To add to what Steve said, I would say: don't be afraid to use the mouse if you're in a graphical Vim. In MacVim, if I want to change a word, I'll double-click

To add to what Steve said, I would say: don't be afraid to use the mouse if you're in a graphical Vim. In MacVim, if I want to change a word, I'll double-click it, hit c and type whatever I want. You might say, "But you had to hit 'c' instead of just typing!" Maybe, but I could run any number of commands over that word instead of just changing it. Also, if I were in insert mode, double-clicking and typing would overwrite the word as if I were in a normal editor.