I am new to the forum, what exactly are we doing with the locking pin once we get to that point and what causes this issue. Also can someone tell me if this procedure is for the laymen, I have done somethings to my cars in the past but never owned a german engineered car. On a scale of 1-10 with 10 being a mechanic, what number would be given for this procedure. Lastly is there a part of the process that I need to be careful not break anything and also on average how long does the process take?

thanks in advance.