Hello,
I have a Giant Yukon ATB, and the big chainring is missing teeths. I do not see any bolts to remove the chainrings. Do I have to replace the whole crankset, with both crankarms?
If I do , what crankset shall I buy? Do I need to replace the BB as well?
I have square holes in the crankarms. Is there anything else to worry about?
I would like to buy the proper tools and to do this myself.

Any help will be appreciated.
Thank You.