I'm relatively new to OS X. I bought a new iMac (late 2013) that came with OS X 10.10 Yosemite. I want to do a "clean install" of OS X 10.11 El Capitan. Here is what I was planning to do. Is this the best way? Thanks. 1) Download El Capitan and make a bootable USB stick. 2) Boot from El Capitan USB. 3) Run Disk Utilities and erase all partitions and the entire hard drive. 4) Install El Capitan to the hard drive.