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It's usually best to mount the scope as low on the rifle as possible without the objective bell touching the barrel, and allowing clearance at the eyepiece for free operation of the bolt. Ask a savvy gun shop operator for advice. Most bases and rings are attached with screws by using socket heads or Torx wrenches.
Begin attaching the bases by wiping the attaching surfaces dry and clean and then applying a thin coat of oil or rust preventive. Check that the bases are properly aligned and that you're not attaching them backwards.