I have a late 2012 iMac that I need to upgrade. In the past I've had all work done by a technician so it's been a while since I've had to do this myself. My question is can I upgrade to El Capitan and then upgrade all my apps (Creative Cloud with Creative Suite/Quark Xpress/Microsoft Office 2011 and various smaller apps)? Or do I have to upgrade the apps first and then install the OS? Should I anticipate any headaches from upgrading from Mountain Lion? Thank you.