When it comes to finding a garage to carry out any repairs or servicing etc to your vehicle, you need to find one that is reliable and one you can trust. Unfortunately, sometimes we have to use a garage that we have had no previous dealings with due to a breakdown for example. This is not ideal but if you find yourself in this situation, you need to have an idea of what you are talking about to ensure that you receive a good deal. People that take cars into garages and say they have no idea what is wrong and could they fix it are asking for trouble.
If you go to the mechanic and say that you have experienced an issue with the vehicle and detail what has been happening, this will give them some indication of where the issue may lie and will often save a bit of time and possibly even money. You could also do a bit of research online previous to taking the car in and suggest to the mechanic that you wondered if there was an issue with part “X” to show that you understand a bit.