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The following assumes that you have somehow managed to install Arch Linux to a single partition on your drive, and that you still have your osx installation on a different partition. See notes on video support before attempting installation! It is recommended to read the UEFI, GPT and Arch boot process#Boot loader pages before trying any of this on your machine.
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To install an x86_64 system, follow the Mac EFI installation instructions. It is probably good to consider on forehand what the differences are and which will work best for you, especially considering the drawback EFI mode has on the NVIDIA driver. Leave the new partition as free space for now. Using Mac OSX's disk utility, create a new partition, calculate the amount of free space required for all new partitions and shrink Macintosh HD to accommodate for this amount. See this site for more information and installation instructions. Keep in mind that since Apple's OS X 10.11 (El Capitan), the feature System Integrity Protection (SIP) does not allow for rEFInd installation in the way described on the Installing rEFInd page. The config will be in your OSX partition - if this is not desirable it is possible to install it later in Arch. The easiest way to begin is by installing rEFInd on Mac OSX before moving on to Arch. This page contains tips on installing Arch Linux on a Mid 2010 13" MacBook Pro alongside a pre-existing OSX operating system. Reason: Multiple Help:Style violations, the article is written in first person, wall of text duplicating other articles (Discuss in Talk:MacBookPro7,1)
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