In distributions that I recommended you in last paragraph are preaty easy to install. The only problem is that you must have bootable media with your choice. Here is tutorial how to do this on Windows and here is for Mac. If you have only smartphone you must do this in internet cafe. When you finish doing this you must boot it. First enter the bios (you can find tutorials on internet) then find and disable secure boot (it is blocking any other divice from booting other than hard drive) and in boot priority settings push your pendrive to the top. Then save settings and installer will guide you through installation.
In distributions that I recommended you in last paragraph are preaty easy to install. The only problem is that you must have bootable media with your choice. Here is tutorial how to do this on Windows and here is for Mac. If you have only smartphone you must do this in internet cafe. When you finish doing this you must boot it. First enter the bios (you can find tutorials on internet) then find and disable secure boot (it is blocking any other divice from booting other than hard drive) and in boot priority settings push your pendrive to the top. Then save settings and installer will guide you through installation.