I flashed it four times. That should encourage you, not discourage you!!!
The probability that something really goes wrong tends to zero. If something goes wrong, there is a community which will help you. olf and nephros are not just simple SF users. They are developers and maintainers for many precious apps, they know very well, what they are talking about.
I never bricked a phone with flashing and I flashed a lot of them. I sometimes got smaller problems which could always be solved very quickly. Often with the help of a community member.
Watch the video how to use emma. It is as simple as it can be. So returning to android is always possible.
The Xperia 10 III runs really well with SF. It would be a shame not to try out.