You may not necessarily do something completely daft like pull a cable in the middle of a flash, but modding your phone is not risk free. On the contrary, there are plenty of ways you can break your phone (to the point of you having to pay someone a not insignificant amount of money to fix it) doing this stuff.
Your questions aren't stupid, but you need to understand if you're not already experienced with this stuff, you're not going to somehow magically learn it all in 5 minutes. You have to take the time & put the effort in to learn it. And everything you need to learn is here, and it's easily found, again, with a bit of effort.
But like most people who come here, you're expecting it to be easy & obviously can't be bothered taking your time/are in too much of a rush.
That's fine, but don't whinge in Q&A if you bust your phone at some point.