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WHAT YOU NEED TO KNOW
Not always necessary, depending on which chainring you want to replace, but all rings are easier to access once they are off the bike.
(see Remove cranks and bottom bracket article).
If you have 3 rings at the front, you may need to remove the smallest ring first to get access to the larger two.
A chainring tool fits the slots in the nut perfectly,a large flat-bladed screwdriver sometimes work, but you may also give yourself or your bike a good scrape.
Reverse the process, by fitting the larger rings, then the smallest. Then put the crank arm back on the bike. Grease the thread of each bolt and use the chainring tool and allen key to get them tight.