carry on with what you're doing, if it's seriously wrong someone will be along to correct you shortly
Only if you are not asking the right questions
I talk to people and try to find people with experiences in the aspects I am looking into. I try not to repeat what I did so sometimes if I am left to my own devices, I take notes on what I do and the results.
If Google doesn't know, ask for help.
Do your best and have confidence it is right