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The easiest way is to buy a Paton-Hawksley Star Analyser grating and the book mentioned below.
The detail and resolution you can get will very much depend on the equipment you use (standard camera/ lenses or through the telescope with a webcam/ CCD)
Getting started i.e. obtaining a spectrum, is relativity easy; getting good spectra and being able to process them to show all the hidden detail...is a bit more difficult!
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