Pre-Installation FAQ
Q: Will this guide void my warranty ?
A: No, at least not in Europe. This is a software modification, if NumWorks refuses you a legitimate warranty claim after that, sue the fuck out of them.
Q: How risky is jailbreaking my NumWorks ?
A: Full on hardware bricks are almost impossible. The worst you can get is a calculator with write protection enabled and an empty flash, which can always be solved with a hardware mod, but the chance of having that kind of issue is very very unlikely.
Q: Can I do this without a computer (e.g. an Android phone) ?
A: All you need is a device capable of running a web browser supporting WebUSB. Android phones can be used with an USB OTG cable.
Post-Installation FAQ
Q: Is it safe to update Epsilon while having a Custom OS installed ?
A: At the moment, NumWorks' installer doesn't check for modded bootloaders, neither does Epsilon, so yes (unless you don't have a bootloader which is probably not the case).