Going to give this a try today, have a few questions as I have not updated my OS before since owning my MacBook Pro. (1) Do I need to write down any internet settings etc. I currently connect to cable using Airport, do all the current settings remain unchanged to get online after the update? (2) As a photographer I use iPhoto often, will this still work after the update? (3) As far as other apps I use, is there a list online of apps that do or don't work when going from SL to Yosemite. (4) Will my currently installed printer still work? Other they using Disk Utility to Repair Hard Drives and Disk Permissions; checking for any updates (doubt there is any), & doing a backup it seems straight forward. Thanks for any info or tips.