My impression of "professional" installation in most boat yards is that the kid putting the system in your boat is paid to do it thereby making him a "pro." If he has done it a few times, that still doesn't make it a certainty that he didn't use poor work and engineering practices in doing so. You will never find a factory trained and certified true professional installer for the many different systems in most places you get your boat repaired. When something goes wrong, most manufacturers will want the item back for warranty work, and guess what, you get to pay the same guy who installed it to remove it for return unless you find a yard willing to certify its work. Good luck with that. I will allow an engine mechanic that I watch every second he has his hands on my engine work on it on the extremely rare occasions my DIY capabilities an not up to the task. I once caught an old USCG retiree worker in the yard putting my refurbished props on the wrong shafts and not cinching up the new shaft couplers correctly. - TRUST NOBODY with your boat which contains your life. If you are a checkbook maintainer, god bless you for supporting the boatyard and maintenance man and mechanic community because you will be paying four to five times as much as I am for cost of ownership, and I have NO, absolutely NO problem with that because when I need that sort of help, they will be available instead of flipping burgers somewhere.