Hi, I'm having a problem with my A4 and I suspect the rocker arm has worn out. After checking the Internet, I understand that knocking (e.g. slack on the pins) or squeaking of the suspension and slightly changed wheel geometry are the very characteristic signs of a defective rocker arms. My question is: do I have to visit the workshop or can I try to replace it on my own? I am tight on money right now, so maybe there are some substitutes and tutorials that will allow me to take it on my own?