Macro: To Prompt Selection of Range and output to Cell

Hi All,

I'm trying to create a macro to prompt a user to (via mouse-click) select their own range of cells, them output the Standard Deviation of those cells into a cell of my choosing.

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I'd like to click on Cell E3, and have it prompt me to "Select your cell Range", Calculate the Standard Deviation of cells B2:B7 (in this case), and display the value in cell E3 (that I had initially selected via mouse cursor). I realize this can be easily accomplished via manually typing in a formula, but this is a process I'll use on multiple; workbooks, many time over, and for the life of me, I cant seem to combine the multiple processes into a single code.