Hello. I have a 2011 21.5" iMac that I wish to upgrade. I already upgraded it to 12gb of RAM but it'a still not fast enough. I wish to install an SSD and power macOS from it, and upgrade the AirPort Extreme card (maybe add the solution of OSXWiFi) to add continuity and handoff features. Is it possible? Can I do it by myself or should I contact a lab? Are there any more upgrades that could "Pimp my iMac"? Thanks in advance!