Question 1 is why do you want to change it from what the chart says? There is no "right" key for any song. Move it to where you can sing it. That chart isn't going to be necessarily where Andy Williams sang it. I have charts that are a full step away from where the recording band played it.

If you must change it, just transpose everything in the chart in your head. The chart is in D. Move everything up one half step. D becomes Eb, A becomes Bb.....