How can I replace the stereo in my 1997 Lexus e300 with a new stereo head unit?

I need to know if possible, how I can replace the old stereo in my car. I found a great deal on this stereo and before I buy it I want to know if it will be able to fit in my car and how to do it. The old stereo is double-din.How can I replace the stereo in my 1997 Lexus e300 with a new stereo head unit?go to best buy if it can be done they will know