Keep an open mind on the merits of anything new that you hear of in this manner. Remember that it takes time to work out all of the "bugs" on anything new. A mechanic's personal dislike for a product, registered verbally, can cause doubt in a customer's mind, leading to a complaint or rejection, whereas prior to this criticism she may have been happy with her choice.
Be tolerant of the installation mistakes of others. You are working in a progressive, imaginative industry; keep yourself keyed accordingly. And don't hesitate to air your suggestion for improvement with the boss—instead of griping to your fellow workers or hiding your talents under a bushel.
LOYALTY TO YOUR SHOP
As long as you're connected with a certain shop and drawing your wages as an employee, you owe that shop your full loyalty. Granted that there are some things wrong with it here and there—the fact remains that to criticize the shop in front of customers and prospects is the worst kind of salesmanship, and casts reflections on your own intelligence for associating with such an obviously inefficient outfit.
But consider what a spirit of loyalty does for your own morale and advancement! The customer thinks more highly of you because a quality shop like yours obviously hires only experts; your boss sees that you have good judgment and can therefore appreciate your suggestions for improvement as being without personal bias; a word of commendation to a fellow worker for a job well done promotes everyone's morale and makes for better teamwork. In such an atmosphere, minor troubles have a tendency to evaporate into thin air.
CONSCIENTIOUS SERVICE
You are going to be a well-paid craftsman in a field where skill and attention to detail are vital elements of economic success. Be proud of your trade. Take pride in your work—every part of it—and perform that work so that your pride is merited and shared by your employer and your fellow workers. In so doing you can't fail to give your employer an honest day's work for a good day's pay. When you build a real foundation of respect for skill properly and intelligently applied in the best interests of customer and employer alike, you can't fail to move ahead to bigger pay and a better job.