^This. Having learned my "professional" bike mechanicing in the UK (where Cytek training/accreditation is a) useful and b) usually necessary for employment) I discovered how well my youth spent working on my own bikes (because povvo) had set me up for doing it as a job (i.e. just adding a workshop full of the right tools and more experienced mentors with product specific knowledge to the basic skills that were already there).
Coming back here and noticing that a lot of LBS mechanics have their comfort zones dictated by what's on the shop floor and some are really just glorified bike builders (and really, not surprising given the wages on offer/job volumes) I realised that experience taught me a very different attitude to what still lingers in some of the workshops round here ("no, I won't look up the tech doc, I'll just have a crack and she'll be right"). The difference is giving enough of a shit to find out and knowing where to find out from*.
Learning how to do it yourself will stand you in good stead if you and the missus get seriously into riding. Even if for some jobs you do still need the LBS, you can better judge if they're competent when you really just need their tools and muscle memory but already have a good idea what needs doing.
*like
https://si.shimano.com/#/ at a bloody minimum guys...
[caveat] don't kill me, I know there are plenty of good mechanics around here too (in fact back in the naughties Farkin.net was teeming with the sort of mechanics who were always ringing each other to figure out tricky customer problems etc. and well into getting the job done right) and I've worked with plenty. I also auditioned more than a few bmx bandits who got through the phone interview with head office and I know some of them got jobs elsewhere in Sydney... I don't think I've ever met anyone who did the TAFE course either...
. 
