have an issue with an installer

Have a guy who has been good so far. He's been installing for a few years, but he is an audio guy. He has no experience with remote starts. We've been working on getting him trained because it's going to be a demanding r/s season this year.
Unfortunately, he has had a couple vehicles in a row that he has had problems with, one being a remote start. After these two cars, he seems to now be afraid to work on cars. He is being incredibly sluggish and is trying to pass every car he gets on to another installer.
Anyone have any ideas on getting him out of this funk? On the audio side, he is a good installer. We can't afford for him to not be able to do remote starts this year though. We have a shortage of good, trained techs in our area, so it would be very difficult to replace him, but I'm starting to wonder if I should just pick up the slack and cut my losses before a real issue develops?
Any suggestions would be appreciated.

I'm speaking generally and NOT as a pro installer - tho as one that can often justifiable condemn certain installs & electrical understanding...

If the problems are simply(??!!) the complexities of modern electrics, I'd explain that that will certainly affect audio in the years to come. But I'd find what problems are involved and then to step thru them - checking that basics are understood. (As usual, I often use related practical examples & traps, and may use analogies {I'm a fan of f.ex Isaac Asimov's "apples & oranges" type reductions as used to explain the Theory of Relativity; hyperspace; Earth's geographical history, etc}.)

Being afraid to work on vehicles IMO indicates uncertainty. Recap the basics and point out untouchable safety systems like airbags (unless their isolation methods are understood etc). Plus maybe his (limited?) indemnity if he causes damage (even the best can cause damage).   
If it's a complexity or time issue, then there's a problem. Is he unwilling to work or learn? If so, praise his existing work & abilities - maybe reminding him how difficult he may have found that stuff to be initially, and entice his new learnings and greater employability etc.
There's also the non-threat - the simple reality that you need someone with these skills and if someone happens to be available... (Times are tough - you can't employ both.)


I try to get people curious and provide a fun - or unstressed - learning challenge. (Emphasis on challenge.) I usually succeed whether stagnant people or olde or stale professionals.

Of course it's hard to suggest without knowing the person, and what I have said is (IMO) fairly basic and intuitive, but it works for me tho maybe that's because of my persona (a knack with humor; trust; and recognition of where confusion or gaps lie & ability to explain from differing angles).