Keyboard shortcuts for Microsoft Excel - entering a cell to edit

I've discovered I can use 'option'+'return' to enter the cell, but this takes the cursor to the end of the cell contents.

Is there a way to enter the cell and have the cursor go to the beginning of the cell contents?

I am currently using: 'command'+'left arrow' to do this.

But if anyone knows a faster (less keystroke) way to do this, that would help a lot.

Cheers.