I want to get rid of some deep seated anoyances in my internal BookPro SSD. The hardware is eligible for HighSierra. If I want to completely erase and reformat the internal drive, how would I go about freshly installing HS? Would it make sense to install an OS (plus HS-installer) on a USB stick first, start up from there and do the HS installation from this external drive? Are there any pitfalls I need to take care of? Thanks for your advice!